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I like what you tried here, Behzad...for me it's just a tad tight - especially since I want to see the spray of water drops as he's shaking his mane...do you have more space all around?
I really like the motion of the shaking head and mane contrasting with the calm front legs and lower part of the mane! I also like that the hair on the mane is a bit blurred. I agree that more space all around would be nice.