I downloaded one B757-200 livery from AvSim(Hooters livery) and had to unzip the folder into the B757-200 aircraft folder. The outside aircraft textures(fuselage) looked great with the exception of the cockpit, wheels,etc...there were no colors. Then I realized that I had to copy and paste textures from an existing B757-200 aircraft(original CS aircraft textures folder) into the Hooters folder. Everything looked fine from there. Of course I am just learning how to load new liveries. So far so good!

Yet, I would still like to find some good B757-300 liveries out there. :P