If you want a heel of any kind I would definitely stick to a wedge! I loved having fun coloured shoes for photos as well, but most of all I'd say pick something that makes you comfortable. I tried to do some of my shots wearing flip flops to save me some walking in my heels but I didn't feel like myself and even our photographer noticed that I was much less present and confident without my shoes. Heels make me feel powerful and beautiful so that's what I wore (you might be able to tell I'm a shoe freak!) wear what makes you feel like the most powerful and confident version of yourself!