/jp/ - Otaku Culture

Do any of you have advice on coloring? I'm just kinda starting to learn. I feel like I understand the basics of it all, but what I don't seem to understand at this point is creating believable textures such as dirt, leaves, water, and clouds. I want to be able to use color to add further detail like scratches, reflections, and rust. I just want some advice so that I can finally start coloring all of my pictures without making them look bad. This picture is what I've accomplished so far towards coloring.

Oh, perfect. I drew this last night.