Good page to choose to color Madara, and your coloring looks alright considering the fact that you're probably fairly new to digital coloring. I say this, because your obviously still young, and you got a lot of years ahead of you to get better at this. All the colors stay within the lines, and you are useing shadows, although they're very subtle, so you're definetly on the right track. Keep coloring, and practicing though, because in my opinion you're doing good so far.