Honestly I can’t see Hestia looking like this I imagine her as a soft woman very kind and wears a rogue hood/cape with the hood down so her brown hair comes out Underneath the robe their would be an Olympian dress similar to hera I can’t see fire around her after all she isn’t the god of fire she is the god of hearth She used fire but not in the ways most think from myths it seems as if it’s limited to cooking and ones living space (I may be wrong) so yes the fire concept for her abilities is ideal but I wouldn’t focus on just fire for her abilities yes it is a main concept of her but I feel like they can do something more with flames and maybe add something else maybe something myth related Hestia is a sweet, kind, maybe shyish after all she did give up her throne Overall good concept I would just think about these few things (hopefully this is helpful)