rather nice
I like the guy's face the most though. Everything that was hand drawn is spectacular, but what I don't like in this picture (I'm just nit-picking) is the clouds in the background. they just sorta look like smears, and in a rainbow-fantasy setting, they don't really match. a big poofy cloud would have matched better. also, the unicorn's horn should be a slightly different color than white. (maybe a pale yellow, or pale, light blue?)
In any case, it's a great piece of art you got there. I'm just throwing this out there, but I can imagine someone turning this into a demotivational poster for some reason.