Maybe if you followed the Adventure Time art style, it'd help. I took 1 hora drawinh Marshal Lee, Marciline's oposite and nkw I can draw in Adventure Time for all my drawings. But it's really good por itself.
Please dont take this the wrong way, Yes it looks good, but it needs touch ups, the hands are a bit disproportional to the arms and Id make the hair smoother, but other than that, its good. :)