So the person is riding the shark, while both of them are being cut apart by a giant saw. I would detail the image of the man and the shark more. The blade and the blood stick out too much in comparison to the man and shark. Also, improve the shark's head since it looks more like a whale. Not bad.
I think the shark needs to look more like a shark in order to make sense. Also the way the sawblade is cropped off from two different angles confuses what's happening. If you redo this shirt, grab a circular saw and look at the blade when you draw it to make it a more realistic shape. There are also several teeth missing around where the cut is. The tops of those teeth should still be visible. I do have a fondness for the idea, though.
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