RIP, and thanks for letting us know. I wasn't really aware of which covers were his, but seeing them there are what I associate with the time period when I was just getting into Dragon magazine - #81 being my first issue.
This looks like a gallery of all of his Dragon covers:
Issues #16, 18, 70, 84, 91, 95, 102, 107 - I remember those last five well. It's not exactly photorealistic, but it's trending in that direction from earlier TSR art, and that's not something I'm necessarily a fan of, but I do like these particular covers of his.
Edit: Looking at RPGeek and the Acaeum Wiki, he also did these covers: