Actually I like the original primarily because it shows me what I miss in the processed version - the area around Charlotte's eyes, and tells me more about Charlotte. Truly appreciate the difficult choices made in BW conversion, and in contrasts, and in photographing black animals. Could also be that the size and compression make impossible the details I'd like to see.
Adorable!!! Love what you've done compared to the original here. My two suggestions would be to maybe tone down the highlights on the nose a little, and maybe to brighten the eyes up with more of their natural color. It looks like they're brown in the original? Might help them to stand out more from the black fur. But wow, that's one cute pup! :)