Here's my thoughts:
-Tyson render seems shrunken.
-The renders are all varying in lighting/color. I'd suggest playing around until they look similar.
-The font chosen wasn't that great. Not a bad idea, but a different (more generic) font choice would be better.
-Not a big fan of the background. I think it needs to 'pop' more, just a tad plain.
-Good use of the U.S. Title and the WM logo.
Nice work Lewb!