I think the art piece is very unique. It takes the usual My Little Pony look in a different way. The highlights and low lights on the body are done quite very well. The shapes are nice and even. I love the fact that its modest and friendly unlike a lot of My Little Pony art like this. This impresses me very much. The stomach definitely shows that she carries a larger conception to come. The expression of her face is very nice. It's very cute and friendly to look at. The colors are very nice and not to bright or dark. I say you did VERY good on this. i give you all 5 stars in each category very well done!
im not an expert, but im not sure thats how it should look like.. her leg seems to be coming from no where and her belly looks like it randomly balloons right before her back :/ try drawing a skeleton of this and maybe i'll understand her positioning a bit better?