I think yes, and I like much better your second try...
Eventhough you have only grass in your foreground I think it helps a bit more to the contrast...
You know what I fear the most when I work a bw conversion... As we know there are out there a lot of photographers that worked bw pictures in a dark room. So to me they know how the green should look when the sky is too dark, and they know how the red should look when the green is pale. I think that when you don't have the right conversion, it would be for them as to see a pink elefant in a blue jungle, or a green sky with a yellow sea.. I might be totally crazy, but I think this way....
That is why I used to make my conversions with the channel mixer. I tend to think that if I work my conversion there and I don't exceed the 100% I will have a believable image.... but again I might be wrong.
Anyway, I am also very keen on bw landscapes.... and I am very happy you like them too, and post your tries...
About Ansel Adams picture, well... it is wonderful!! and so is the landscape... The subject in this case is great and I think it has too much to do with the "beauty" of the photograph.
I don't want to take away any merit from this picture and the photographer. I know that for some people he is "the master" in photography, but to make a rural scene, a boring countryside field look interesting has a lot more merit to me. Then is when you put all your art and craft at work....
I probably think this way because I live in that kind of environment, surrounded of rural scenes and boring countrside fields...