The base coloration of the horse is very nicely done, but, that being said, I feel that the spotted markings lack depth and appear to be floating on top of the horse, rather than being on its fur. I would recommend lowering the opacity of the spots to about 60-70% and then adding another layer set to Soft Light to darken the markings where necessary, while still allowing the lighting to show thought.

d to the horse, I feel like the wings are less detailed and don't quite match, especially color-wise, but also in texture. This may be due to the character's design, of course. <img src="e.deviantart.net/emoticons/s/s…" width="15" height="15" alt="" data-embed-type="emoticon" data-embed-id="391" title=" (Smile)"/>

I am fond of the flow and ebb of the mane and tail, as well as the sand beneath the horse's feet. With regards to the sand, I do think more strict attention should be given to how sand flies up under hooves, as it moves a little more like dust in this image. Sand, especially when damp, tends to cluster and become more concentrated.

Finally, the seagull to the far left is much closer to the horse than the others and I feel as thought it should be less burred. The same goes for the largest seagull at the top of the image.

I gave the vision 5 stars for the composition and sizing. Originality got 4 stars because horses running along a beach is a common motif; I don't always see artists adding in the sand flying up, so I gave it an extra half-star. Technique is a little lower because of the seagulls' motion blur, the wings, and the spotted markings. I gave 3.5 stars for impact because I very much like the background, the clouds are great, and the horse (for the most part) are very nicely rendered.