all those sites, except for http://groups.yahoo.com/group/juggsnakedclub/ legally own your image once you upload it to them. they are free to resell and distrubute that image to where ever they please and to who ever they please. your naked self could be the next coca cola ad, and they wouldnt have to pay you a dime. if i were you, i'd stick to juggsnaked club for uploading nudie pics... and poses? i like the kind where the vagina is visible
juggsnakedclub is really good about respecting your choices too... I've had pics up and down there a couple times, and while people may gripe about the pics being taken down, it doesn't make them ferociously angry. I do try and warn people sometimes if they're gonna be taken down, so they can save themselves a copy if it's really that important. speaking of... I should do some self-shots again