Looked good to me. Not sure if there should be a little more dust as the rock rises and when it breaks up.
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And perhaps...there appears to be no motion blur. The viewer learns from the previous shot that the camera is handheld (and therefore making the pretty matching movements with the rock); but then appears to have an immensely fast shutter speed to capture the explosion.
Very well executed! 3D studio max is an awesome, but hard to master piece of software, but so realistically good at reflection maps, shadows etc. A little tweak or two ( and I know these tweaks take hours, if not days) will polish off the realism perfectly.
My opinions are just that . . . Mine. It's not personal, but is based on my emotional and professional reaction to requested critique. If you choose to ignore constructive comments, I'll just assume you're a vanity poster and not posting to improve your filming and editing skills.
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What i liked about this was that you put effort into filming and acting. Although it was just a test piece to try the effect, you made it watchable.