This is actually a pretty good picture. The contours, shapes of the characters, and proportions are all spot on and for the most part they move properly. (I imagine the cutie marks are absent due to getting the hang of the illustration program you are using.) May need to recolour AJ's hair ties as red, unless there was a technical problem that kept you from doing so. (It does throw off the colour balance.)
The only big problem is the weirdness of Dash's back and tail. I assume she's meant to be lying on some sort of surface? With the way her legs and arms are splayed out I imagine her back and wing would flatten accordingly as though she was on the ground or bed. (Likewise the part of her torso facing upwards would rise up a bit.) And the curvature of her tail facing the surface would flatten as well. As its stands it looks as though only her back is resting on something separate from the rest of her body and something else is stretching out her arms and legs.
Of course I've never done vectors before and I'm not sure what challenges you faced drawing this. Otherwise a good effort though. You clearly have a lot of the fundamentals done pat.
Actually disregard my comments about the structure of Dash's body and AJ's hair ties...I read the comments on the other piece and the ones here again and I just realized you used an online program specifically meant for producing images of ponies...which means you were probably much more constrained than what you could do with a normal illustration program. (Yeah my weekend has been like this...)
Still, quite a good job and choice of poses. It's one of those images that tells a story, but leaves a lot of ambiguity as to what the story means. Why is AJ smiling so intently, and why is Dash blushing while looking rather sour? That intrigues me.