Photo album thumbnail size to small1

Where do you change that at? 

it depends on the photo size you are uploading, you can try make changes in

m/photos/administration/settings

Width of photo browse unit (in pixels):
Height of photo browse unit (in pixels):

10 Years Later :-) Anyone know where I can change the photo album thumbnail on the profile page. Not the actual photo but the album thumbnail where users can quickly flick through the photos using the arrows. Cheers.

Hello callum!

You may try to change the max-width parameters for the div.sys_album_unit_wrp.bx_photos_album_unit_wrp and div.bx_photos_album_unit div.sys_album CSS classes. The default set you may find in the modules\boonex\photos\templates\base\css\browse.css class