I do change the batch number for each one. It's quick and easy to do thanks to Photoshop. The 22 represents the name "Double Dos" or "double two". It's just a play on my last name, Tewes... which we pronounce as "tooz" as in Ones, Twos, Threes....
I can see the Jawa sand crawler in the background! It's actually a treeline in one of the photos I used for the background. I could remove the treeline and see if it looks better. (note: I haven't done that on the image below) Thanks for the feedback.
