First one's nice enough - foreground's a bit messy, but you've a captive model here, no problems with a re-shoot and tidier foreground.
Second one, I can see what you've gone for, sharp face on the pony, blurred out background. Sadly, even though it's a bit blurred, there are still two highly noticeable and distracting horses arse's in frame. A little more time spent in composing, and waiting for the shot and you could have made sure there was just the one subject in frame. Also, i'd have shot this with something like a 70-200 at the longer end and wide-open aperture, just to get the background a little more OOF.