Postcard mockup

This is a postcard design I sketched up for the end of year Art Showcase.
I wanted this image to be realistically shaped, but to retain the cartoony visuals to put it in between the postcard and the poster designs.
The tanks shown in the postcard (from left to right) consist of a; Panzer IV, RU 251, Elefant tank destroyer, FV215b, Centurion Action X, Panzer II 'Luchs', and a Waffenträger auf E100.
On the back, you can see how I re-used the image from the business card as a small decoration.
I had 20 printed off, and all of them were taken (bar one which I kept for viewing purposes).