You will never find a professional appraisal on these sites my friend only the memebers are here to judge what the domains can fetch but I think think indigenousgallery.com in my eyes would be the best to develope a website which could lead to selling it at a good price.... Because there is just so many tourist sites out there I dont think them 2 you have could bring could fecth much at auction and the rest seem unusefull. I would say indigenousgallery.com could be worth about $1000 and more I would suggest you do something with it, let the rest expire or try and get rid of and hold on to indigenousgallery.com.
In australia they have art gallerys with only aboriginal art... I mean its the rare ideas with limited amounts of site on the idea which have a good chance of making it.... If he was to put aboriginal art on the site and send it to afew search engines everytime time someone typed aboriginal art his site will be the only one to come up due to limited if not any competition.