Ship Designs - Speedpainting and some Roughs

I made these as a demo for my cg and concept art class yesterday. The demo was about simple techniques for creating ships / aircrafts / vehicles and other hard surface objects with simple Photoshop tools, like the basic selections and the lasso / polygonal lasso.

first rough using the polygonal lasso tool

second rough using a custom brush created from basic shapes

third rough using a custom brush created from a small part of a photo

speedpainting with varying different techniques