First two are great! I love the exposure differential between foreground and bacground in the first, and the composition of the second. The last is a dramatic perspective, but I must admit that I have never seen a fisheye image that I wouldn't have preferred to have seen taken with an UWA lens, even if the coverage is less minus the fish effect.
With adapted lenses I found that it was good to mess around with them if you already had them or could find them cheaply, but I could never seriously build a system around adapted lenses. They're still fun to use, but the native m4/3 lenses do it so much better.