Beautiful model and congratulations for taking on advanced SolidWorks modeling skills with surfaces. Surfaces are heavily used in the consumer product industry and in the outside shells of a more humanoid-type robot. Creating surfaces to be used as cutting plane is also an important skill in machining.
Using advanced features like sweep and loft with surfaces are illustrated in creating this butterfly
http://blogs.solidworks.com/teacher/...butterfly.html
You can download the model. There is also video instruction on how it was created. Photoview 360 was used for the rendering
http://blogs.solidworks.com/teacher/...oview-360.html
Marie