Yo, you did a great job on both of them. You capture the essence of fun and seriousness that's involved in fighting games. I love how fun their expressions are and how interchangeable you made the pose. The board looks intriguing and detailed perfectly.
The only thing that's missing is maybe a fighting icon or a small speech bubble that says "KO!" or just something that adds a little 'zazz on the fighting-game personality.
Super impressive, though. It's professional and fun at the same time.