Can your face change in less than a year?

This is a picture of me last year at 18 and I am now 19.

I'm at university for medicine.

This astounds me that I look so much more different? These pictures are only 9 months apart.

Can my face change/mature that fast...?

The one with the cat and the one in the burgundy lace dress with the brown belt vs the one with the stethoscope and dog and tattoo.