I've spent the most time so far on NightCafe and Artbreeder. The former is kind of hit-and-miss on what the tech puts out based on your prompts. The latter allows you to refine faces and features more, but also has limitations.
I'm going to try a Slideshow here. All of these images were made on NightCafe. I have a lot of trouble with eye color (request brown, get blue, etc). These are alphabetical, based on file names.
-Almost Lukkas. Should be about halfway between the shirtless wonder and the beefier, serious guy in attempt 2.
-Asgrid is an evolved version of an attempt at Birgit that finally got the eyes I wanted, but the face shape wasn't right.
-Birgit has blue eyeshadow. No idea why. It's just what the tech threw out.
-Princess A is going through a name change right now. I haven't learned how to control the close-up level, but the first pic does a good job illustrating her moody teen tendencies. The second shows her too young but gets the hair and eyes right.
-Harald was an attempt at another character, evolved into Harald. He's fun!
-Jorgen should be halfway between these two.
-Maja. I did not ask for fantasy. This is an evolved version of an attempt at her that ended up looking way too young.
Next, some work I've done on Artbreeder.
Of the three Birgits here, I'm kind of stuck between 3 and 4. I think 2 almost looks too innocent. Birgit is very innocent, but she has hidden depths. If I could combine those last two with the one from NightCafe, it would be just about perfect.
Note: on Artbreeder, all my attempts at Princess A have ended up looking too modern. Not sure why.
Note: on NightCafe, if you use the prompts "Viking" or "Viking Age" you are apt to get horns growing out of the person's head. Amusing, but not helpful.
I'll happily answer questions if you have any. Thank you for reading.