Looks good to me. I like the flow and composition of the stethoscope. I don't mind the white space at all, if anything it makes the image more interesting (sorry Egg).

I would recommend adding some color to your image. Right now it looks like you have used black and white and gray. It would look a little more natural if you used very small amounts of color. The metal is a good example.

http://www.xaraxone.com/webxealot/wo...tallics_05.jpg

The image posted here is part of a mini-tutorial on metals in Workbook 37. The gray tones are a little richer.

Hope this helps.

Gary