Thanks for the comments all.
Rimmer - I didn't pay much attention to the histogram, which is my fault. I assume that the spikes are from the conversion of the tree to black and white, though I could be wrong in that? I'd offer that the face in the photoshopped version is a little bit blown out and should have been brought down.
Bohdank - Not sure if image #1 is OOF? It doesn't really look like it to me, but clarify if you have a moment please so that I can improve next time around
I'd also agree that the colours are a little bit overdone and a little bit over-saturated. It was hard not to get trigger happy on some of the adjustments just to see their effect, but then again I shoudl have known better than to post over-postprocessed images into a critquing area! My bad. Which photos do you specifically think are over-sharpened? Maybe I was too excited to explore the unsharp-mask feature.
Thanks for the comments all - would to hear further explanations and suggested improvements. I'll hopefully look at these in another year and think, wow, those photoshop adjustments are nowhere near what I would be able to do with them now.