I'm sure there are tools out there that can help you manipulate this image without the need of any drawing device (it does help though for those that are creative with a pen

). If you want to go into image editing but don't want to pay a load of cash for programs like Adobe Photoshop, then I would highly recommend using The Gimp:
http://www.gimp.org/The mouse was never meant to be used as a sketching tool. Even drawing letters can be a pain. If you want to do a lot of sketch work, invest in a electronic sketch pad.
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