Yes, I like the tops as well, the whole clouds actually. Perhaps soften the bottom more? I've done some work on clouds too lately, and found out that you can also use a surface shader with a negative black color (+input) to adjust stuff (at certain heights), and use the child input to alter the feel of the cloud. There are always new ways
I guess blue nodes can do the same (like bias, modula, clamp, whatever, but I'm not really good at those (at all).