Roxas Sketch

I got bored in Art History one day and started doodling Roxas, and I liked how it turned out, so I decided to save it to use for tablet coloring practice. I tried coloring it a few times and failed, and I tried again tonight. I was trying to color it so it would look good without any lines at all but I failed, so I decided to just try coloring it so it would look good with the sketch on top.

I still fail at using my tablet...I can't figure out how to paint nicely and get something fairly realistic...everything just looks rough and sketchy... I need some good digital painting tutorials...I can't any good ones T_T