This is not looking great. Bad character design, and worse colors! Every facet of this needs work - design, colors, lighting, pose, perspective, composition. It's not really possible to give helpful critiques on the piece as it stands; I do have advice though. Start small, work on your fundamentals, sketch/work in other mediums, practice practice practice. You've clearly got the patience and willpower to tackle this sort of thing, you just need to start at the beginning!