The funny thing about this it's that my style completely changed during those 4 years and it's not so easy to say which one is better. I know one thing - 4 years ago I used a lot of photos for my digital paintings and I spent weeks doing one. Now I draw a lot faster than before and everything is based on my pencil sketch, not photos. I think it's a huge difference that makes my art better now! I hope so, at least.
Pencil & Wacom Tablet, app. 5 hours