Hi. I've been studying some of the enviros, concept arts and speedpaints, and I've noticed that they usually have strong, straight parts. How do they make this? Do they use polygons and then paint in it? I tried it, but it looks too concentrated on the edge part, losing that rough-yet-true feel. Are they preset shapes? Custom brushes? Or is it just really great hand control? I tried the Shift+click method but it only works vertically and horizontally.