I think some of the fieldss on advanced search would be better with checkbox than combobox. For examples, ethnicity, build, hair color, breast appearance. If I want everyone except one ethnicity, I can just check all ethnicity and uncheck only one.

I have suggested this and other similar ideas a few times.  I thought that this newer version of TER might have implemented some of our suggestions, but very few actually were.  Too bad really, these kinds of things would have greatly increased the utility of the TER database and search.