Open the flat on photoshop or gimp.
If photoshop, Merge all layers.
3D > New shape from layer > Sphere
You can move it around using the rotation tools, And I cbf explaining how to animate.
If gimp, Open it as a png.
Filters > Map > Map object
Then from the drop down select Sphere
Move it around and shit using orientation, Then save them and put on a picture blah blah blah.
I don't think that's a good walkthrough, But eh.