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I have no experience with this type of processing or goal, since I rarely look at print ads.
That said, I think you have created a striking image by the play of light across the runner, the detailed accent of his musculature. It looks artificial but I would think that is not important compared to grabbing attention and a bit of Wow!
Possible tweaks that come to mind:
I think the darkness across the face is a bit too strong. I might pull back some shadows there slightly. Perhaps same thing in the darkest areas of his biceps. I'd leave the running suit dark as is for pop/contrast. You might darken the shadow a tad more. Creates a nice effect. It could also be heightened by pulling back the burning/vignette lower right, or brightening the adjacent ground just to the right of the shadow, just in a smallish area. Sky seems quite bright upper left. Maybe mine some details there, darken the upper left corner?