I seem to remember the newest pictures you upload stick in first place, so it goes recent to old anyway. I don't think you can rearrange because that would mean they would get a different link and would mess with pictures you already posted. No?
ETA/ Hmm now I'm not so sure. If the link would travel with the picture then there would be no big deal, but I don't think that's even possible on a photohosting site. Or am I totally wrong?
Just thinking out loud...
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