Do you have a picture of the shed you want?
My comment wasn't meant to be sarcastic.
If you have a digital camera, (or a cell phone with a decent enough camera), and a picture of the shed , you can put the two together good enough to give you an idea on how it would look. You just have to have a picture of both the shed, and your yard.
Try to take a picture of your yard at the same angle that the shed in your picture is sitting, then cut, copy, paste, erase, etc. It won't be photoshop perfect, but will work to give you a good idea of how it would look.