Felix I think that's a great idea Felix! And I certainly have no problem giving feedback to anyone who asks for it. I think with a "criticism wanted" tag I would know that the particular artist does really want tips/criticism on their works. It also helps if people actually put in their upload description something like "criticism wanted/appreciated."
Why should I share a painting and what do I expect if I do so
Maybe two different "halls".. one for display and CCs ( claps and cheers) and one for advice. And I would propose in the HALL ( Hall of Advice, Lore and Learning ) goes everything people want help/opinions on.
Tom0779 to answer your tag why should I share a painting and what do I expect if I do so, my answer would be to have everyone else in the 2" brush community enjoy what I've created. I get to enjoy my works anytime I want but I'm really glad we have this website so I can get these out into the world. I do post them on facebook too but this is a special site as we're all artists here.
I do appreciate any and all tips though too. Next one I do with evergreens I will be using the tip you gave me just the other day. A lot of times I have my spouse look at my piece when I think it's done and get his opinion. While not an artist he gives me a lot of good criticism at times. Then it's up to me what I do with that criticism.
A separate space is a great idea!
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Felix I think this is really a good opportunity to do so. I just want to add, that criticism does not need to be seen as unfriendly if it is objective. See I think if somebody gives me a hint to improve then he has really looked at my painting and I feel honored due to this. I know I am no professional artist and I do not need to make living out of it. This makes it easier to see things objective.
What I feel is that most people only "judge" paintings which kind of fit into a mainstream scheme (e.g. I don't like Nic Hankins riverbend sunset which is quite popular recently, but I would give any hints or comments though). And this isn't objective. I always try to look at technique, composition and how the picture is built up (e.g. no strait lines, less symmetry etc..) But as said, sometimes I don't write it...
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Felix BTW: Felix: Due to the serious interest of member @LJMpaintings to learn the ink and wash technique, I have started to share watercolors again.
I also have gone back to watercolors to dabble again 
I still like my oils but it's a nice change of pace
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wybnormal To me it is no go back to watercolors, I love them more as any other medium. 3 out of 4 from my paintings are done with watercolors.
Oils work the way I think.. always changing my mind 
But I love the look and textures of watercolors.
When we post a painting there is these two tick marks if one wants feedback or not. I was thinking that may be by default option we need to highlight one in red and select do not want feedback. And one in green welcoming for feedback. May be color of the name to adjust when in a view mode depending on a selected tick mark red/green. Maybe red is too aggressive. So let’s say blue/gray. But green one for feedback and criticism.
@Tom- I agree with you. I suffer because of English sometimes when I want to explain something about how to improve certain thing in a painting. But my main concern that I cannot comment much about media I do not use or have little experience with. Please don’t be offended by this. I think you raised a great discussion here. Next step would be to try to digest that criticism and accept people spend time on sharing feedback about painting and see what one will want to do with that info.
For me , I am not a professional artist, so I don't feel that I should give advise. Giving criticism without the help to fix, doesn't seem helpful. Maybe I am wrong in thinking this?
I can and have given tips that have been shared with me. But I don't think this is the same idea.
I remember once that @Sunnylady asked for help from community about how our eyes wandered on her painting and I enjoyed seeing everyones response. And I think (I hope) we helped her.
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Sunnylady you could never offend me, I got so much information from you all the time and I remember some great discussions we had.
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LJMpaintings I think almost all of us aren‘t professionell artists, in fact I know only Nil Rocha. Maybe advice isn’t the correct word, sometimes I just would be glad about several hints. 
LJMpaintings I agree with ya. The more I think about this I also think it's up to the individual artist who uploads to ask for help/criticism. What I mean by that is in the piece's description saying something along the lines of, "the sky turned out ok but I'm not happy with my clouds. If anyone has any advice I'd appreciate it." Then the rest of us know that person is actively looking for help.
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Mgiese84 everything you say is true. On the other hand there is already an option to let others know that you wish feedback. Everytime you upload a painting you can choose between two options. Maybe this is overlooked often but in every painting I have seen yet I can read: „This painter appreciates constructive criticism and tips.“…
Tom0779 thank you Tom! You are so kind!