I agree with this one. I currently create my own cover with models/actors as face claims and I still do. Now I'm starting to use generic stock photos from Canva and anything I can find from Google.
But nothing comes close to beautiful artworks and ultimately I want to see them visually when I'm able to purchase commissions from here. Thank you so much for taking the time to share your experience as a freshie here and the artist recommendation!
Interesting! Finally, something every author should be entitled to. 
On the mature part, I find this place much more reliable in restricting readers below 16-18 and I'm happy with the main tab they have up on the page. So I'll take note of that. 
I should have clarified that my kind of 'sexy' means that I want the guys to have stylish poses, wielding weapons and looking good in their battle regalia. Not the butt naked stuff, haha. That'd ruin the tease.
I will be sure to say this specifically when I go about requesting artwork commissions. I expected the prices could reach to that kind of maximum, but I'm shocked nonetheless, haha.
I've read the thread you linked and it helps with my understanding a lot! Thanks so much for your welcome and sharing your experience. 
This is interesting! Thanks for your valuable insights, @domisotto. I will follow these guidelines, see how it goes and share my experience here!
The link you've given is extremely helpful @MaeRose! Thanks a million! Glad I have about three completed books to test the algorithms out. 