Cute Oc! I like how her mane goes down the sides of her neck, leaving her throat exposed- stylistically, its an interesting choice and prevents it from feeling too heavy. Also, I love that she has a forked tongue, its adorable and a trait that isn't used nearly enough in my opinion, haha!
As for your username dilemma, I recently had my username changed (shortened, specifically). At the moment, there is no mechanism or feature built into the site that lets you do that (Bogus is pretty busy with a lot of stuff, and she is working solo, so I can't blame her), however, try messaging BogusRed about it. I don't want to put this out there and flood her with username change requests, so to any who read this, please do be sure you want to change your username first, as well as what you want to change it to