For me it would be (some already been said):
1. Male Miqote hands (as the OP said) - far too rigid looking, relaxing these just a small amount would be much more pleasing to look at whilst retaining that "claw" look.
2. Whilst we're on the subject can the male Miqo straighten his neck a bit (not sure if anyone else gets bothered by it but they always look like they have a crick in their neck or a humped back to me).
3. Option to hide tails on Miqo, Aura and Hoth or at least fix clipping issues with them - very off-putting when running in some gear and the tail just cuts through it.
4. Re-design Summoner Egi's so they don't resemble gummy-shapes and give us more to play with. (Former FFXI Summoner main - I loved how the avatars worked/looked in that)
5. Restore pet-targeting for Summoner - I miss using Titan to tank an enemy whilst I blast away (and some class-quests were designed around this making them more complicated now).
6. Increase Trusts to other expansions (granted may take a while as they'd need to sort out programming for each dungeon but would be nice to replace squadrons with them).
7. Increase number of trust characters available - doesn't need to be Scions, could be other characters from around Eorzea or randoms like in Squadrons.
8. More character customisations.