She seems to be quite cute I think. I'm guessing from her outfit, she's a background character who acts as a maid for whoever the main character.
I feel if you gave her color, and added a backstory to her she could be a good background character that some fans might enjoy looking forward to every now and then. Like one of those things where people see her and wonder what is on her mind, however I could see that might take from the main character.
While she is a cat girl, her ears really make me think of Pikachu at the same time. Nothing off, I just find it to be an adorable similarity between the two. Also like the small lightly drawn spots on her that make me think of where the light maybe touching her.
With her current pose as it is, kind of makes me think she prefers to be alone or she may have a lot to say but knows no one will listen to her. Her expression and outfit are very nice. The heels are just lovely too.
Overall, a background character, but a cute background character at that. Hope that the series you create that has this background character in it goes well. :D