Murmillos said:

Nicely colored, but why does she have to look so ... unwelcoming

It looks that way for two traits that dont go together are presented:

You have the stare of "Pervert" or "How dare you?" from the pony. Then you have the raised tail and spread legs of the rear end. This is very 'inviting' pose with just completely contradicts the face.

Overall a very confusing and hard to look at picture....