The art, as a whole, is very nice looking and adorable. The only things I can see that are wrong with is are the proportions. The neck seems a little long and fat, and from this angle, it looks as though the body is the same size and thickness as the neck. The whites of his eye being green is a bit disconcerting, but I'm sure that there is a reason behind it which I'm not seeing.
Otherwise, the art is great. The background is amazing, the lollies are well done and the stand out. The shading too - the shading is done very well. Especially the shining parts of his mane and tail.
In summary, the proportions seem a bit off, but otherwise, the art is great.
Keep up the good work!