>>5873878Instead of trying to imagine the finished piece, try imagining the basic shapes, at least long enough until you draw the shape. Then from that point forward, you can simply use construction to draw the rest of the picture. It wont be exactly as you want but that's the fun in art, you draw and see what comes out.
Like if you wanted to draw a girl, you can't just imagine her and then print her out like a xerox. Build a girl and then give her the features you can concentrate on in your head one at a time.