Some of these concepts are pretty interesting.
Some pictures naturally have mistakes in them (particulary those which feature human anathomy, where it's actually appliable) but I like the direction you are going for - eventually your works will lose this slight feeling of childness of doodles made in the math workbook.
I am glad you didn't gave up on art and still improving.
The only concern - please, pretty please, work on your fonts more.
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Nice stuff, classic style but, in your lines (and dots).
Only thing to cc there are a BIG one,
If you draw RL draw on GOOD paper and use GOOD ink!!
Do as you like but stop puting your own effort down by drawing on thin lined (sht) paper. Clean sheets from any printer are better! A 5usd worth of papers are mandatory for a 100hour efort!
Sry the caps lock n all, but this is important for you going afther your talents.
(sry my speling my native are norwegian 8P)