You have a real cartoon feel to this render... The edges of the desk and dresser are too beveled and not sharp enough..

The Blunderbuss needs to lie on its side, no weapon can sit on its side like that.

The glasses look like sunglasses and need to have raytracing enabled to allow the distosion of the papar under it.

The cap seems to be floating a little...

Good work, just some tweaking to be done. i suggest using Mental Ray as a render to minimise the toon look.