Learning new mediums can take a long time. One of my favorite tips for starting painting is from Lee White in the podcast. He said when he started painting he wasn’t going to start judging his work until the first 100 paintings were done. This allows you to relax and not stress so much over mistakes, if you mess up that’s fine because it’s all just practice. 100 may sound like a lot, it is, but truth be told you are still in the early stages of painting by your 100th piece. Art takes time and a lot of patience. Critique your work as if it is not your own. Avoid negative critics and look for what is working and break what isn’t working into a problem solving game. Any time you see something that doesn’t look right ask yourself these three things. Is the form correct, are the values correct, are the colors correct, in that order because that is the hierarchy of importance. Form > value > color
Could you tell me what your exact process is so I can help more?