I wanted to try dithering, and I'm satisfied given the small amount of time that I spent on it. I was partly inspired by this much more detailed piece by gennoveus.
Thank you for the mention, Mashpoe! Very nice commander Data. For a while I didn't remember the reference and thought Data had become Cardassian! I need to watch Next Generation again; I'm starting to forget. I hope the new series with Patrick Stewart goes well.
I don't think you need to "fix" it :D You did a thing, you learned from it, that's what's important.
Thank you for your criticism! I can definitley see what you mean, the dithering makes the piece harder to read and there is too much of it. I will probably try to fix it later, but I don't think I will be able to do so without increasing the color pallete size. Next time I try out dithering, I will make a larger piece.
Dithering is better-suited for larger pieces; on smaller pieces, it's easy to end up with dither areas that are only a few pixels, and those pixels end up reading like unintended detail rather than as dither. This has happened on the nose, chin, and lower eyelids in this piece ):