IMPORTANT:
This model has been more or less (I hope) obsoleted by the V3 of Greek Sandals (which also has an Illustrious version). Try using that one with "closed toes, below ankle" for the same effect. It seems at least not any worse at it and should be more flexible in general. I'm leaving this up in case you definitely want these though.
The sequel to this that nobody asked for: What if you couldn't see the toes? Pretty much the same issues apply, but I've been managing to get some good results out of that one by now. Just be sure to use copious amounts of styling LoRAs and the usual Pony prompt voodoo.
Note that Pony has a strong preference for toes, so these won't show up reliably in wide frontal shots. Detailing or inpainting may be necessary.