Beware the 'wow...look at this' - factor which is an issue with 'image generators'.
Ninetynine point nine times out of a hundred what you suddenly discover 'you can do' with such proggies as Bryce and Terragen, etc. has been 'done to death' by countless thousands before.
That chrome torus floating above a rippled water foreground with dolphins rampant over palm trees is actually less rare than rocking-horse poo ...by a long shot....
There are sites/examples on the net of amazing results achieved with that lowly MSPaint.....where it is definitely the talent of the artist and NOT the program used.
Think....
1. Experimentation
2. Practise
and
3. MORE practise.
Doing your 'own thing' is what it's all about. Don't expect the proggy to do it ALL for you. It won't.
Main thing is to 'JUST HAVE FUN' ....