Where can I change the thumbnail and gallery picture sizes?
You can change the picture size for model thumbnails available on the first page and gallery sizes in Admin -> Settings -> Gallery Settings. Thumb width & height define the sizes for Live Models / All Models pages, Thumb2 width & height define Random Models pictures (small pictures that appear in the footer of some pages), Thumb3 width & height define the model Profile picture. Once a large picture is added to Model Gallery, all the thubmnails are automatically generated.