I like your depth of color on the red, green and blue. The eyes are nice as well.
I'm not sure brown is a good color for the wings, looks odd. Especially since the claws/horns seem to be the same color. I would lighten up all the claws/horns to a bone color highlighted with white.
Congrats on painting such a gigantic model! I'm looking at doing mine and was searching for ideas. Yours is the only one on CMoN. At least one named correctly.
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