I think if at all possible, you should try to pursue this without giving up your university course. I'm not saying you shouldn't try, but art is an amazingly competitive field and it's always worth having a backup plan.
Looking at your first drawing: it's alright, but it's kind of messy. The lineart feels very rushed, and could do with some refinement.
The face is pretty difficult to read, too - the eyes are all wobbly, and the overall feel of the face is that it's saggy and melting.
The arms are literally all over the place - I know that's what you were going for, but they're a bit over the top compared to the rest of the character.
Overall, a good start, but you'll need to put in some serious work to make it into a career option.
As a side-note, I'd recommend looking into realistic anatomy (if you haven't already done so) - pretty much all professional artists/illustrators will tell you that you need to understand realistic anatomy before moving onto stylised works.
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