On my bouncing around the internet I found this VisoinUnion. They posted my energy Tree, It is only avaible in chinese but you can translate it in Google.

I came across some great resource for design sketching.

I would also highly recommend this book..

Sketching: Drawing Techniques for Product Designers

How to Sketch a MP3 Player.

Sketch Rendering.
A Awesome Photoshop Tut.

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