I really like the horse/griffin thing - the red against the minimal white background looks great. In fact, I think it looked better before you added the stripes - the simpler colouring seemed to work better - but that's just my opinion.
As far as the birds go, I'm still not sure about the yellow. The red of the beast looks so good against the white, and I can't help but think the yellow of the birds distracts from that a little bit rather than complimenting it. Maybe they could have been a similar shade to the scary horse thing?
The composition is dull. Try cropping it down in different ways to see if you can get a more dramatic arrangement of shapes within the rectangle.
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As seedling said the composition isn't helping it but I also don't like the perfect roundness of the rocks, I can see your going for the old style japanese ink paintings but it isn't working with this one....