I think I would have tried a different composition. i think the black and white works better here. To be honest though, its not your best work. Not trying to ruin this for you, but Im just trying to help. Im guessing this rock is kind of small. Sounds weird, but could you pick it up and take it home. It might be a fun subject in a light box. Something you could get your black belt, lens hood grabber, harley riding friend to build for you. :-)