Sometimes when a drawing isn't coming out quite right it's because I have overlooked some principal of perspective. I don't like to plan my artworks when I'm playing. I prefer to jump in and see what happens. Along the way I may realize my drawing is looking funky (not in a good way) and when I step back and think I realize this scene requires multiple vanishing points. If I like the drawing enough, I'll start again with a plan.
Don't give up on those good ideas that aren't turning out properly. Just set them aside; because, one day, when you're working on something unrelated, your mind will make a link between something you just learned and that old painting that wasn't working and you can now bring that old drawing to real life with the new insights you've acquired through patient practice of your art.
Sherry Barrett is an active artist who takes inspiration from great works of literature, historical figures, and wise people.