The composition is fine and the exposure looks dead on. The nib end looks to be a trifle out of focus, or maybe its the resolution of my monitor. Try using a smaller f-stop and the depth of field will increase and make the whole picture sharper. You'll have to slow down the shutter when you do that though.
Looking at your background material I agree that the nib just slightly got out of the field of focus. a very good picture. still looks like a struggle for a good exposure with the dark pen against a lighter background. that is always a tough one. overeposiing woudl cause the pen to get brighter.
those comments are mainly pointers to help manipulate the outcome if you wanted to but this is entirely a satisfactory photo.
Looking at it, I would have to say you were just a hair too close (the reason the tip is out of focus). If you backed away about 1/2 inch I think you would have a perfect shot.