experiment with placement, the first doesn't even look like you used an off-camera flash, and the second has a flash flare and a lurk-flash.
To further elaborate (how many flashes are you working with?), for the first I would have put one flash on the coping to the right of the camera, projecting onto the subject, and the other inside the bowl somewhere hidden and out of the way, just to illuminate the spot. That's the main problem with taking bowl photos, is that the deck and coping will be lit up but the inside won't be. For the second, I woul'dve kept that flash where it is, maybe moved it over to the left by 10 feet just so it is out of the picture and angle it accordingly. Then I would've placed one directly diagonal to it which would be to your right, right at the coping. That way the skater is slightly rim-lit, but he is still lit from the front.
Remember to keep your horizons straight and your lurkers elsewhere. 