Nicely done. Since you asked for critiques, I'll offer a few. However, as the guys above have all said, these look great for your first few pens, so please keep that in mind.
On the oak, the wood near the tip is a little proud of the metal, and the finial end looks to be a bit under-sized. On the bloodwood, the fit isn't too good at the centerband or at the tip. The fit looks much better by the time you got to the ash pen; looks to be almost spot-on. The shapes of each of the pens are nice, although the bloodwood looks a little out of balance to me. It looks like you were trying to "beef" up the writing end a little to provide more grip, but to my eye, because the top half of the pen is also curvey but doesn't match, it looks more like you were trying to make them match but didn't quite succeed.
It's hard to see the finish on any of these because the picture is fairly grainy and out of focus. Try a picture with a less busy background so the camera will focus on the pens. Also, try shooting the pens all in the same plane paralell to the plane of the camera lens. The skewed angle you have in this shot allows the focus to change; a shot more directly overhead would likely have produced a sharper picture.
Please remember, as with any critique, these are just my two cents worth, and even at that I may be overestimating their value!