Oh no, human beauty is hard to vary because it was created by natural selection. Which is creative force of its own. That's the reason things in nature of are also hard to vary, because they were created by a process of variation and selection. The beauty in flowers has been excavate slowly over thousand of years by the co-evolution of flowers and bees which makes them hard to vary. Human beauty has been excavate slowly over millions of years by a sexual arms race between man and woman which makes it hard to vary also.
Above you said "I don't think all scenery is beautiful, nor all cloud landscapes." However, above you also said "I find beauty in other examples of apparent randomness - the scattering of the stars, the pattern of waves on a shoreline or out at sea, the sound of wind in the trees". The key word here is "apparent". Are you appreciating randomness or not?
If you are, then you have to ask yourself 'what is it about this randomness that I like? Is it merely an intellectual curiosity, or is there something within the randomness that I am perceiving as beautiful'. Is it just that you like anything randomly, or is there some combination of elements in nature that come together in very specific ways to make something beautiful. If the former, then you must concede that EVERYTHING is beautiful. If the latter, then you agree with my criteria. You appreciate features in nature because they are hard to vary. In which case, there really aren't two kinds of beauty. This is only one kind.
Suppose you do agree with my criteria. The next question to be asked is: can one thing be more beautiful than another. If not, then mozart really was wrong that there are real mistakes in his waste paper pile. Are you willing to commit to this. Are you willing to say that mozart is completely and utterly wrong?