Nice idea, poor composition.
Your coloring is alright, but the obvious slop job on the background detracts from everything.
Your outlines on the characters don't match the general shape of the characters, nor do they even reach the bottom of the page.
You in fact didn't bother to erase the coloring on the legs of one on the left, as the white can clearly be seen poking through the calves. The blue one's coloring can be seen poking through the outline of their thigh, which is completely disproportionate to the body.
Your head sizing is well off, and causes the blue one to look very flat and muted. It is very small and misshaped.
The outlines where it crosses along the ball are not following the arm shape and the thicker ones actually go into the ball. This is a terribly sloppy effort, and all around looking quite rushed.