That's fine. If it's too large I may need a layered PSD file to handle organization though.
It's a yes/no decision based on the combo of both the OC and artist. I'm not gonna say that one is fine but the other is not.
That would be accepted, yes, but there's certainly room and time for improvement too.
Technically yes, but if there's at least decent effort and the base isn't a stolen trace of someone's art without permission, I'd look the other way.
For a flying oc? That'd be fine.