Don't worry about the colours mate, I learned after my first submision to use a pallette.
It's a beautiful piece, though I'm not sure if I would say it's pixel art. Pixel art usually has clearly-defined pixels and colour pallettes, so if you want to redo the piece with a much smaller colour count, it would be a great addition.
755 colors? 0_0 Did you use any filters there (I can't zoom properly, that's why I ask)? If you did, I strongly reccomend you not to... Moderators tend to be quite strict on these matters. =)
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Don't worry about the colours mate, I learned after my first submision to use a pallette.
It's a beautiful piece, though I'm not sure if I would say it's pixel art. Pixel art usually has clearly-defined pixels and colour pallettes, so if you want to redo the piece with a much smaller colour count, it would be a great addition.