Hi Gerardo,
the diagrams with black background look nice and are easy on the eyes.
However, if someone wanted to print out your diagrams, it would not be good
because it uses too much ink. Maybe there is a way for you to make it "look"
like the background is black (maybe some kind of overlay) but the image is
actually mostly white.
Many of my photo diagrams have a black background which looks really nice but
it becomes a problem when I want to put an arrow outside of the paper itself.
Here, I have to make a special arrow which is not black in color so it shows up
on the black background. You have avoided this problem a little by making the
paper gray so the white arrows will show up on the paper and outside of the
paper. It just seems like more work because now you have to paint all elements
either black, white, or gray.
Diana
