That's a pretty cool pen. I can see the blank is aptly named. I assume poxy = epoxy resin? As for selling, you will get a ton of different thoughts, but you'll have to consider your target customer.
As for photos, that is challenging. As Steve said, lose the distractions in the background. If you plan to sell online, take a look around at Etsy and see what looks appealing to you as a potential buyer. Once you have an idea what you like, you can work on the lighting and color balancing. I will also refer you to the resource library for that, but there is also a forum dedicated just to photography. Ultimately, you will need to take a LOT of pictures to get a feel for what works best for you. I would love to see this pen at a couple other angles.