I’m a ZBrush noob so any advice or constructive criticism is appreciated
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Hey there! I’m by no means an expert but I’ll tell you my advices. There are tons of problems with the bust. For the first try its okey, but honestly any critiques would be pointless in this case. My ultimate advice is to sculpt a skull, then sculpt the head again and again and again. Then post the third sculpt of the head. There will be “only” 4-5 big problems with it so people would give you critiques.
Cheers, TMK 
Your project is really in too early a stage for us to critique IMHO. Also it would help if we knew who or what the end result is supposed to resemble. From the limited info in your post and screengrab, I think you may have subdivided to soon, which runs the risk of turning it into a blob.