Amazing Steve, your getting releasable quality stuff here, and you've only just started on this...most impressive.
I will bung any skies I do your way, so you can add them if you wish.
I'll take a look at alpha textures, and how to deal with them - I've got the drift of what they do, but not how to create a texture with them - so yes, thanks, I may well bend-your-ear at some point. I have no intention of doing anything on a great scale, but would just like to learn a bit more about how things are done - and to create a few things for my own use.
I will happily try your clouds, if you would like another opinion of them in use...
This is another I am doing, similar colours, but deeper, less vivid, tones on the horizon.