Hey there,
I would say a pen is a high touch product. Most customer wanna feel the pen before it is bought. Since you cannot let the visitor of your site touch the product, you have to make all the efforts possible for him to see what he is going to get. Your pictures are good but as mentionned above, they are resized, I would go with a higher resolution for sure. Your pen are top quality.
My approach is probably not the best, but the pictures I have on my site are high resolution enough to be full screen on a 24" monitor, the pictures are big and slow to load, it's the tradeoff but as a user this is what I would want.
During my university online marketing class I learned that you basically want to create is a mood, an atmosphere where the user is losing his perception of the time and his spending time on your page. On my photos I do not adjust any colors so it is as close as possible to the reality but on the other hand I do modify the background where I remove the saturation and I blur it. The point doing that is to keep the user focused on what you want to show him, the wood, the finish, the beauty of the pen. The more details you have regarding the construction and material is important, you have to educate him on the construction to show how unique is the pen.
Most of those advices are not applied yet on my site but this is how I plan modifying mine!!
My 2 cents,
Charles