It’s unlikely someone can make it for you as 80% of the site is joining Minecraft, but, you could have some people help you with design choices.
So far he seems to be a cyborg with a jet pack and a turret on his back that’ll break it in combat.
I recommend making both lower legs grey as a start, then remove that gradient ellipse, that doesn’t need to be on the figure if you’re representing it blasting off, use better effects for that.
Then, make his whole body grey, and lower arms grey too. Head seems fine for now do leave it.
Remove the jet pack/turret too. Do this and then make another post. Thanks!