Firstly, N3V doesn't seem to be taking avatar submissions anymore. It's been quite a few years since they did. I tried a while back to get them to allow me to update the ones I submitted with no luck.
Secondly, any avatars you submit would have to be fully your, or you have permission to upload them. Not saying you didn't color it in, but the style makes me think that it's someone else's line art (I think I've seen it somewhere)
Thirdly, there were rules on the size on the avatar. If they were to re-open submissions, those rules (or updated versions) would likely still apply. As I don't know what the rules would be if they were to re-open submissions, I can't tell you if you're image would pass. What I can tell you is that it is smaller than the current set of avatars.
peter
Edit: Adding on to this post, as it fits better than more more recent one.
An additional rule, at the time that I forgot, was that submitted avatars had to be gif files with transparency.