I would personally make the left one (That is bent, not the one thats holding the cannon) A bit bigger, not by much but enough it does appear more like the size of the other ones. Trust me when you bend them like that it can become hard to tell if they are the right size, It took me quite a while to realize that and I still manage to mess up from time to time.Here as an example, you want them to appear around the same size so try toying around with it a bit, try resizing both and playing around with them, if all else fails try just adding her other hoof up in the air or at her side, Even on her cannon as extra support witch would show how heavy it really is.