This is what my screen looks like in Adobe Illustrator right now as I work on the cover for Valda Goes Through Hel. You can see the linework I have done so far in the center of the screen and her finished hammer is in the upper right. They are both surrounded by reference and inspirational images.
After all the line work is done I do flat colors and then bring everything into Photoshop to add lighting and other fun effects. The cover creation process is a source of joy and frustration to me but I am hoping I can get this one looking half as good as the image that is in my head.