Here are a few of the illustration that I created for a site I just finished working on. All the final images were SVG files but many of them started with a photo reference or with original art created in Photo. There are a few that were all done in Designer as well. For some of the images (such as the quasar and the fusion image) I also used Flame Painter which is a fractal paint application and would then bring those elements into Photo to composite and adjust them to get the final art. I can go into more of the process if anyone is interested.
Cheers!
Jeff
The Universe from A to Z