One other bit of advice. Concentrate on composition. Where does your eye enter and leave the frame? Do horizontal or vertical lines stop the eye from wanting to see the entire image?
Then, take a step back and ask as objectively as possible, what is the most important thing in the image. I hate to say it, but your wood chunk takes away from the pen.
Compare #2 and #4. #2 makes me want to look at the wood and as it sits out of frame, the direction of the grain shoots my eye right out of the image and I am ready to move on. The wood grain is vertical, stopping my natural right to left flow. It falls out of frame, so as it redirects my eyes, I leave the image.
#4 is much more successful. It is ABOUT the pen...no doubt. In fact, it wasn't until #4 did I even notice the texture of the pen itself.
This is not to say that you can't stage your image. I think the ABSOLUTE best sales images out there are staged with contextual objects. You just have to be careful what the objects are doing to the composition.
