Some photoshop tutorials to try out

http://www.robertocampus.com/2007/06/photoshop-tutorial-wonder-woman-pin-up-digital-painting/
http://blog.spoongraphics.co.uk/articles/25-tutorials-for-getting-started-with-your-wacom-tablet

Lemme know if you have problems here..

http://idrawgirls.com/tutorials/2011/10/20/speed-painting-tutorial-mech-robot/

Another decent tutorial website

The lips can be moved a little to the right.
Lines may need to be solidified for this style.
Legs may need ome practice creating 3D volume into them

but the ost tough part would be the metallic texture...
http://idrawgirls.com/tutorials/2011/11/07/how-to-paint-metal/
http://dianae.deviantart.com/art/Digital-Painting-Tutorial-74468761 (a fav)

Try this exercise...just get the meta;l texture..with only the photoshop brush tool

Try this img here...