I would ask what the intended purpose of the photos is. If you are showing them to sell, try not to distract from the pen. The second picture does that very well, even though it may seem rather plain.
As for the first picture, it looks like the cap is a bit blurry. I've had a lot of trouble with that, though my new phone does very well. It's annoying when the camera only wants to make a section of the object clear. I find it better to shoot from a little farther away and sacrifice the resolution a little by cropping. You just have to be mindful of the surrounding area as it can affect white balancing.
The last picture is great as far as composition, but doesn't show the pen/blank well at all. It doesn't really draw your eyes to the pen. That looks like a really nice blank, but it doesn't stand out enough.
I think you'll find that pens don't look good on solid white backgrounds for a couple reasons. Something neutral always works best so it doesn't wash out the pen or the background. I like something with a little texture. Also, reminder to self, I really need to lint roll before I start shooting.