Welcome to 3D
and I'd say for somebody just starting - that looks great!
Unfortunately, I am not familiar with Bryce
so my comments will have to be kind of generic.
The lighting looks a little odd to me
Mainly because your shadows are almost dead black.
Is there a way to add some ambient light in Bryce?
In Microstation I try to minimise the ambient light as it simply dumps light everywhere - which is not the best way to apply light.
but some small amount is usualy beneficial.
also - i think it would look more "natural" if the light source came from a higher angle.
would be cool if you could make the lamp a light source
Speaking of the lamp - I think that red is a little too hot
kind of overwhelms the rest.
The other main issue is mapping
You have some nice maps there but I think you will improve the image if you vary your wood a little and add some dirt/wear/texture.
The base color of the walls. trim and workbench are all pretty much the same and it looks artificial.
First thing I'd do is to try and make some maps that were specific to the surface.
The top of that workbench is a great oppertunity to add some realism.
The rusty texture you have on the guns is pretty nice - but you might get better results if you pulled back on the rust a little
also looks a little stretched in places.
Maps are the key
fiddle with them constantly