Practice

Okay, time for meh SERIOUS post (put's on a SERIOUS face)

First off, love the shading you did, it matches well with the small patches of color you have scattered around the piece.
Also the color's aren't bad themselves. I mean the different shades compliment the art very well and help bring it out.

As well the lines are nice and smooth and the coloring is rather calming and relaxing. I love this, I love it so very much!

Not just the art style it's self. But the "character," is nice in design and their facial expression is relatively welcoming and friendly.
As well the background-less "background," is a nice touch to it so the viewer can imagine any scenery they want!