The pens look pretty good. However, for such a close up render I would recommend trying to push the attention to detail just a little further.

For example, add a bump or disp map to show the plastic seam lines created during the moulding process. This type of pen is also split into top/bottom sections, usually with a more defined join line. The push buttons could benefit from having a fine gap between then and the white main section. This will help with shadowing and also make it feel less CG and like two pieces of geo are just intersecting.

Great job overall.