It's debatable whether that's a spiked bracelet, bracelet removed or a spiked anklet, anklet removed. It looks like it would be impossible to fit over her feet. Harpies are usually drawn without hands or wrists, so a bracelet would be equally impossible. However the keyboard, smartphone, and pen imply that she does have some form of hands.

Arcana55 said:

It's debatable whether that's a spiked bracelet, bracelet removed or a spiked anklet, anklet removed. It looks like it would be impossible to fit over her feet. Harpies are usually drawn without hands or wrists, so a bracelet would be equally impossible. However the keyboard, smartphone, and pen imply that she does have some form of hands.

There's a lot more art of her (it's far from Danbooru quality, though). She does not have hands.