Hi! I figured out a shortcut for perspective with the pen tool (and a quick instruction on how to draw straight lines) in Photoshop.
As happy as I am to see people gain the confidence to try out backgrounds, I should mention that it takes more than a trick to draw good BGs. I urge you all to try to learn it properly through research and draw from observation. Thomas Romain has a good batch of incredibly detailed, in-depth look into perspective on his twitter. I also learned at lot from Perspective! For Comic Book Artist by David Chelsea, it really is a must have for all types of BG work. Work hard and good luck!
On the Lucas Baker picture how did you make the shed looking lettering on his jacket? It looks good and I'd like to be able to try it