It's a interesting take on the theme. You really got the old digger across, with his facial expression and his pose. You screwed up or at least didn't care for his anatomy, the right leg (his left) and arm are weird. But I never know what you were going for with your stylized drawings. You did a good job on the hand resting on the pickaxe handle.
What I like about your drawings, is that you can always discover something new when you look at it several times. That's also what makes them so hard to review. But the little extras you hide in your art make it even more worth looking at it.
Generally I like the definition in this drawing, I mean you can instantly make out what is what. :D
I love the stone! :3
Overall I dig your old digger pic!