As artists there are many skills and info we need to know and be able to do in order to paint a pleasing picture. When things don't turn out the way we wanted them to we get disappointed. This disappointment stems from the gap between what we think we can do and what we can actually do. When this happens.....Keep Painting!!!!!!
Failure is not only likely but inevitable. Why should you magically be able to do something that you’ve never attempted before? Of course it takes a little practice! With failure comes frustration, but gratification is the reward for keeping after it, and few things will strengthen your self-image more than personal growth.
My mentor used to say if 1 out of every 4 paintings turned out then he was happy. That was shocking to hear for the first time, but now I understand it more. The key here is that by embracing the reality that you will struggle, it makes you much less disappointed when you do. This frees you up to enjoy the process. especially in art.
You are unique, and sharing what’s important to you is definitely worthwhile. What a privilege it is to be able to do it through painting. In summary, KEEP PAINTING!!!!!!!