So uhm, hi. New user, hope we get along, etc, etc(there's no intro board, so that's my intro

). So this is the piece I've been wanting some help with:

It's mainly for AA practice, but I also wanted to try doing bigger pieces because most pixelart I've done are game sprites and the like. Anyway, I probably need another buffer color or two, and maybe a highlight as well? I'm still an amateur when it comes to picking colors

Plus some of the lines are iffy, especially on the dark, tube things.
Oh, can I throw in another earlier piece I did? It was mainly to familiarize myself with aseprite.

I'm content with this one, but if you can suggest other improvements, please do!
So.. that's it, thanks for reading.
