"You may not be educated well in the areas of etiquette and the like as a princess, but you do throw some bashing good parties!" Not all princesses are pink sparkles. Exhibit A
Overall this is good, I especially like the hair. The only things I noticed were that the person on the right's chin looks a bit off somehow ... maybe too long? And that the hands look slightly odd, too bendy. I think they could use some more straight lines.
But besides those things, this is really good. Good luck in your contest!
Overall, it looks like you spent a bit of time on this and I wish you all the best for the competition. However, there are a few nitpicks that I have considering a few things. First of all, like it's been pointed out, the chins seem to be a little too big. You might want to double check chin lengths using reference photos for the best outcome. I think the eyes could have been better, like more shading in a few areas and some details to give them more depth since they're looking at each other, it'd be nice to have the eyes be the main attraction of this picture. Anyway, I like the hair - I always find that to be harder than anything else. -__-
Good luck! -Pink
There are three rules for writing a novel. Unfortunately, no one knows what they are. -W. Somerset Maugham
[while trapped in a bucket of popcorn] You know what the worst part is? It's not even butter. We're gonna be destroyed by... ARTIFICIAL FLAVORING! — Blake Bradley, Power Rangers Ninja Storm