That's fine - most of my work I put under a creative commons non-commercial attribution license regardless of whether I put it in a stock category or not, so I'm happy for you to use it as you've attributed your sources including me .
In your piece Loki's look has the feel of him saying "You have a problem with this?"
You have wonderful pictures in your gallery! Now I have a question.. can I use this picture, 'neighbourhood watch' and 'sitting bengal kitten stock 2' for a graphic on howrse.de? Of course, I would link back to your account.
There's very little of my photography which I don't put under a creative commons licence - usually only photos featuring people - so most of my photography can be used as stock I just don't always explicitly mention or categorise it as such!