Great photos, maybe slightly better crops, and try dabbling with shadows, highlights and color saturation, and also sharpening in photoshop. I know the difficulties of dealing with the reflections and focus issues with housings.
Sweet photos. Can you teach me? I like your technique. Mine are mostly phonecam pics. I gotta get myself a REAL camera. LOL. Check mine out at http://members.fotki.com/bubblychase849t/about/