The second pen image seems noisy (grainy)...what ISO setting are you using?
And do you know what aperture setting the camera was using?
For this kind of situation, I would put the camera in full manual to take control of the exposure. I'd use ISO 100 and since the camera is on a tripod just use a slow shutter speed. Take a bunch of pictures using different settings (aperture and shutter speeds) and see how they come out.
Are you shooting in JPEG or RAW? If JPEG, what resolution are you using? Are you using the highest setting? You should be.
And what kind of material is the pen lying on? Is it a solid color or is there a small pattern to it?
How much post processing work are you doing to these images? Are they straight from the camera or are you editing them a bit?
I can see some spots in the images...looks like dust on the sensor. Your camera needs a sensor cleaning.
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