One thing to keep in mind. do you have all the rights to use the characters clothes etc. They might have been free items but if you read the fine print they are often for non comercial use only. My criticisms about the pic are that the red dress attracts all the attention. That is what you focus on. I would change the color to white to signify a kinship with the Unicorn and it woudl get the attention back to the unicorn. Use of depth of field woudl be good here. Also a thing to remember if this is going for pring the resolution will be massive 1500x1500 minimum. Use a premium setting to get better shadows. I like to use true ambience to get nice shadows.

The wit of a misplaced ex-patriot.
I cheated on my metaphysics exam by looking into the soul of the person next to me.