Coloured pencils can look nice but in this case it just looks like it has been coloured by a child, I'm afraid. I don't think it goes with the line work.
Lose the lines in the background - they're not done well and this kind of background pattern would be done at the design/artwork stage, separately to the drawing.
Work bigger, there is not enough detail in there, and work on the pose - she needs to have her arms out or a smile and looking up or something to make it cuter.