Postcard

I chose the JPG because it good for pictures with many colours and it allows high quality viewing from programs.

The background image is 1440 x 1080

I picked everything so it would contrast against the black background.
The white text on black and the graphic effect around the astronaut.
First I put the background, then I used the wand to paste the astronaut. I then used mask to paste the rover.
I used the stamp tool to make the effect around the astronaut. Finally I typed the words.