First sculpt, where to go from here?

So this is my first sculpt project. It is an alien, the thing over his mouth will be a breathing machine because I’m also planning on putting a background on the sculpt and making it so the alien is a fresh N.Y. citizen and is exploring the world, but the backstory doesn’t matter. So I have my best set up and now I would like to know where should I go from here on how to detail? I’m also working on the eyes since I finally figured out how to detail them a little more.

What stands out as terrible, and what are the best parts of it?
I’m not really sure what to ask here since this is also my first post lol.
But thanks for the advice in advance!

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