I love this so far! Looking forward to seeing the finished product.
There are a few things I would point out though. I've done a quick edit of the picture to show you.
(1) The fire would be casting some light on the wolf's fur.
(2) You could make more of a yellow transition around the fire to make it fit into the picture a bit better :]
(3) The fire probably wouldn't cast as much yellow light as you have done on the floor. For example, if you have a fire in your fireplace, it doesn't make a strong yellow glow on the wall opposite - more of a soft glow.
If this picture was at night, the light would be more obvious, but since it is daytime I would suggest toning the light down a bit.
(4) The shadow of the wolf could be lightened a little bit - the fire would shed some light over it.
Hope this helped! :}