I made this model of Iron Man using front and side blueprints.
To make the earth I used 6 textures for the different visual effects (diffuse, bump, specular, night lights, clouds diffuse and clouds opacity) and a bigger sphere with angle-dependent opacity for the atmosphere.
Front view:
![Iron Man front](img/imFront.jpg)
Back:
![Iron Man back](img/imBack.jpg)
Process:
![Iron Man process 1](img/imProcess_1.jpg)
![Iron Man process 2](img/imProcess_2.jpg)
End result:
![Iron Man result front](img/imEndFront.jpg)
![Iron Man result back](img/imEndBack.jpg)