Originally Posted by
Downrigger
Andrew - this is an interesting treatment of an intriguing scene. Your placement of the stream provides compositional strength but does so in opposition to brightness of the rocks. For me, those two elements compete, and unhelpfully so. Since you were interested in showing the ice coating of the rocks I can see how this came out this way. I agree with Dan, too, that the ice/frost feature doesn't show well in this treatment.
I found that cropping about a quarter off the right margin brought your subject rocks into more commanding position in the composition, and resulted in a more clearly a supporting (but important) role for the stream. Experimenting with that, and exploring treatments of the ice that more clearly bring it out (maybe brushing with decreased "clarity"?) might be helpful.
If you are planning to explore B&W seriously, I would recommend considering the NIK software plug-in package - it integrates with LR well, and its monochrome module "silver Efex Pro" allows you be be both precise and adventurous in working with your images. The other modules are nice to have too. Check out some of the instructional videos for NIK to get a feel for this nice tool.