Dead turtle edited in HDR with high contrast

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Dead turtle edited in HDR with high contrast, a photo by Nicola Zingarelli on Flickr.

My vision of this image wasn't clear to me until the other night, when I thought that a 3 exposures HDR could give me an edge on the editing. Said that I created two virtual copies in Lightroom one at +2 and the other at -2 EV and put them together in Photomatix with the original one. I pushed the cursor to create the creepiest look I could and then returned to Lightroom for the final touch, with more contrast and clarity. The doubt is if I should have had more vignetting or not...