I'm 5'3 inches,108 lbs. Is 450cc too big? (photo)

Hello and thank you for your question.  The
best advice you can receive is from an in-person consultation.  The size, profile, and shape of
the implant is based on your desired breast size/shape, your chest wall
measurements, and soft tissue quality.  This decision should
be based on a detailed discussion with equal input from both you
and your surgeon.   Make sure you specifically look
at before and after pictures of real patients who have had this surgery
performed by your surgeon and evaluate their results.   The most
important aspect is to find a surgeon you are comfortable with. I recommend
that you seek consultation with a qualified board-certified plastic surgeon who
can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D.
Harvard-trained plastic surgeon

Thanks for the question. Always a physical evaluation is what have the last word about what volume is better to put in the implants. It depend in several factors such as chest diameter, wishes of the patients.. Based on your photos I suggest you volumes between 350-400cc to fill the breast properly but still achieving a natural appearance. Kind regards