The idea is great, and so is the result ^^
If I were you I would use contour lines around every little detail for future paintings. Some of the lighter colors (White, grey, skin tone, etc) are almost identical, and would stand out better with a line to seperate 'em :)
And for the colors, it's hard to see you're color blind - I'm not entirely sure how that works, but you were great at shadows and highlights and used the right colors everywhere. Maybe the horns being green is a little bit odd, but then not again - green is one of the Christmas theme colors, and it only adds to the epicness. I would have used another color than the light green presents, they stand out too much, and are thus both slightly irritating to look at, and removing focus for the real man, Mr. Claus himself :)
If this sounded negative at all, it's not. I just figured a good artist such as yourself is praised all the time, and would be more happy to recieve a proper, critical review instead. Well done, mate :)
Thank you for the advices, really appreciate it, and don't worry, I didn't take any of it as negative, far from it, just as things that needs to be improved, as I know there is tons of stuff. For the next challenge, definitely going to be implementing what you suggested. ;)
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