I just started seriously with pixelling as well, and I declare myself a newbie with lots of problems with palletes anc colour choosing, so, this might be dare, but... I think "your" face needs a more constrated colour choice. I would lower the position and increase a bit the size of the eyes.

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I come here humble, trying not to repeat the mistakes of the past, for improving my art and try to help the others improving their own when I can...