wanted to try myself in drawing.

here goes WIP of skull with overload of anatomical mistakes

Looks to flat, try adding some shadows or something.

i'm still working on it

I know, just suggesting things to add.

I'm sorry, but that barely looks like a skull. Maybe just the general shape of it, but that's it. Try drawing from observation instead of just freehanding it. That allows you to see a skull as it actually appears instead of just the way you remember it, and ends up looking a lot better.

the cheek bones are actually cave in one point and do a kind of turn and reconnect with the skull before the jaw attachment and the nasal cavity (need to be bigges) it starts a bit lower than in the middle of the eyes cavities.
If you see it from the front, the wider line is the the cheek bones one.
remember also to shade and make the temporal bones cavities.
lot of technical stuff

You have done some mistakes with the structure of skull,
look at my little correction.

This video shows how to simple shade with brush and eraser, using opacity,
try it once and see results.