Suffering from serious self doubt.
Writers always give the advice be a reader; that by reading you broaden the sense of what you want to write for yourself. Painting can be derailed though when you start comparing your work with others. Firstly there is the ‘it’s not good enough.’ feeling, which accompanies every piece. There is the ‘my work is copying theirs, it’s not original’ feeling. That one is a killer as influence is important, visual learning and acuity is essential but plagiarism is abhorrent.
I suspect that sketching, doodling and not overthinking is the key.