I don't know what it's called, but I often see this type of style being often used in animation illustration. Shapes are clean and shading relatively simple.I did a similar one before, but only did recently became more fond of this type of work.Anyhow, do tell me what you think as I hope to do more of these.Is the yellow tint unnecessary, or do you think it should cover the entire background? Are the colors harmonizing well? Any which you may think I can improve on.