Antique Glass Plate Photo Negative "Lumberjacks for a Day" 4 x 5

This is an Antique Glass Plate Photo Negative Portrait of "Lumberjacks for a Day". These three guys look like serious woodsmen, don't they? I suspect they are simply clearing some trees, but they appear to want to be taken very seriously. Here's the best part of the picture, though: see the dog? He's looking right into the camera. Perfect! He's saying "I did most of the work. These guys just helped" It's 4 x 5. My photoshop and scanning skills are not so hot... I'm sure someone with better skills can get some more nifty detail out of it than I.
It needs a thorough cleaning. Has scratches on the emulsion and some wear around the edges (see photo)