For me, it’s placement. I can get away with a drawing that is slightly off, or mixed values that still need adjustment. But the biggest thing that gets me is placing the paint in the correct spot on the canvas. I think this is the hardest thing about the DMP method.
Going from pallet to canvas. I also think this is what makes the artist though. This is where you create, and make your painting yours! The more disciplined artist will labor over placing each and every value while the more liberal artist will ignore these imperfections. Therefore art is a reflection of your personality and character. I think all art and artists are beautiful because of this (execpt maybe Botero, sorry!) anyway enough rambling, what is the hardest for you when creating art?