The sprite, but you didn't blend it in, doing any effects etc etc. In the squirtle one, you've done much more.
I made an epic shadow. It's behind Shadow. O: That's an effect.
It should be the darkest. >_>
Shadow is about shadow. Make the colour really dark blue.
I'm not big on dark colors. If I'm doing something such as making a signature of a game sprite, then I usually go with the lightest shade of the darkest color.