There's an interview with Mike Winterbauer at Sega-16. The veteran artist is responsible for some iconic art of classic games of the 80s and 90s. He talks about his work for Might and Magic games:
Almost always I was given minimal information about the game I was supposed to do cover art for. One of the exceptions is the Might & Magic covers and the maps I did art work for, I was well-informed about the game and characters. Typically, I was handed screen shots and a synopsis of what the game was about. The games had a low-res quality about them, so the storyline and gameplay were integral to the success of the game. This enabled me to be very creative in coming up with a cool idea for the box cover.
The Might & Magic paintings I had a lot of time to paint. I worked on each of the pieces for well over a month, as there was plenty of time to paint each of them. They were all large paintings, being 30 by 40 inches on board, and I wanted each of them to be the very best I could make them. I hoped that the paintings would one day become valuable, and that is why I painted them larger, as larger collectible paintings can be highly sought after.You can see Mike's artwork on his Web site. His superb painting for the Land of Xeen map is certainly worth another look.