It's instantly recognizable as Jackson, so great job. I think you need to work the mouth a bit more because he has a bit of a blue steel expression.
Try committing to lines instead of making short scratchy strokes. A smaller brush would help, as would some perspective lines draw out beforehand. Don't forget you can click, then use shift+click to create a straight line. As for the design of the ship, I don't find it attractive nor practical. For example, tiny sub-light engines stuck to the side of the hangars is just strange.
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