I think she is Thea(nekojira), not argus.But Pixiv's tag is argus, so I'm a bit unsure.

Well, I can confirm that this is Thea, and other Theas painted by this artist (such as pid145874151) are also labeled with the tag argus. Thea has her iconic dragon horn, while argus does not, but I don't know why there is an argus tag, which is strange.