Thanks everyone for all the advice
This really means a lot to me since I just started using PS, and I really want to get better at it. I downloaded the trial for Illustrator so I'll mess around with that, and thanks Nouman for those guides/websites. Also, the next drawing I'll do I'll make sure to add in the pupils .-. To be honest, just up to recently most the eyes I've drawn haven't had pupils.
This is a picture I'm still working on at school (Picture taken with phone, not scanned) (I havent touched up on the coloring which is why it looks sketchy)
As this is what I did last year in my art class, which, they don't have pupils =x
But again, thank you all for your advice