My very first oil painting, and I made quite a few beginner's mistakes. First of all, I rushed it. It looks so simple and doable in 30 minutes, but an untrained person can easily need 3 to 4 hours to complete such a painting. To start, I used way too much liquid white, which resulted in mud mixing all the way. My basic tree shapes turned purple due to the blue sky underneath, and the highlights just added more mud. Also, I realised afterwards that my palette knife was much too hard, which didn't allow for gently creating a path.