I re-did some things on the original flash, and wanted to make it darker, so I did.
I added some yellow to the arms and feet. and I changed the way the back looks.

Then, I re - shaded the whole thing, making it more 'dark and corrupt'
I decided it would be based off of when Barry Allen goes through stress in both the comics and in the real show.
Intresting... Huh?

Reference: