Puppet Warp

Before                       After

Adobe CS5 has a great tool which allows you to manipulate objects in an image such as a tree branch or arm using anchor points.

I found a great tutorial that explains how to use this tool from

The Russell Brown Show

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Oldie by a Goodie

Here is an older project that I put together around the time the first Transformers film came out.  I put the model car together then took the photos and edited in Photoshop using quick selection, free transform, and brushed in the shadow.  I now know that using free transform, gaussian blur, and opacity levels to create a shadow for your object is a much better technique. Below are the starting photographs.