To me makeup doesn't seem to change Deonna's look as much as it does for Iris. With or without her heavy sparkle, I can still see the same Deonna. For Iris, I saw a very different person w/o the makeup - not bad, just different. It was the same with Shawniece, as someone above mentioned.
For Big Red, the heavy makeup is aging; she looks considerably younger without it, so a lighter touch would be more flattering.
I noticed as well, since on Unfiltered she's at most maybe wearing some foundation. I also pictured her in a simpler gown, but I know they have limited options. Maybe she felt like she had to wear it for that day & it would go better with her dress. If she doesn't normally wear makeup she probably couldn't wait to get it all washed off that evening.
Happy birthday - sparkle on! ✨