Thanks
I used photoshop for painting and wings3d for modeling.
The process to produce the art was this:
First, to create the normal maps you...
1. Model a basic shape of the object in wings3d.
2. Set the camera in Wings3d to look down at an angle twice as high as the distance along the ground. Focus in on the object you modeled.
3. Set the camera to orthographic (so there is no perspective distortion)
4. Squish the model along the X axis by
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math.sin(math.atan2(2, 1)) --> 0.89442719
(this has the effect of making a circle placed flat on the ground appear as a circle and not just an oval).
5. Set the shader to display normals (wings3d has a shader for this but it needs to be modified slightly).
6. Take a screenshot.
That's the hard part. Then I took the normal map into photoshop, scaled it down to a width of 32 pixels using nearest neighbor and painted over it to get the diffuse map and line art.
Heres another test, using ambient occlusion to reduce the amount of light that gets inside the jar.
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