Unfortunately, this can't be something I can accurately test on my end since I have a fresh art gallery without any unlocks (I will elaborate below). Though what I can see is that you've set the artist override for both Sam (bust ID is "techie") and her nude variant ("techie_nude"), which both have LiliRuru as a possible artist. These are only unlocked and visible during the Saendra quest, I believe.
Once Sam is recruited and onboard, I think she'll be wearing the steelesuit, which has a different bust ID ("techie_steele" and "techie_crew_nude") and only have Adjatha as a the possible artist, which explains why it doesn't normally show up in your gallery options (similar can be said for her jail variants). Now this isn't a major issue as Sam is one of the characters you can override with an Alternate bust artwork (using an existing in-game artwork that has been unlocked).
The Alternate bust option will only work if you have any of Sam's previous busts unlocked in your Art Gallery. If you can see the "Alternate" option, click on it and choose Edit. This will bring you the possible options based on all the bust art you've unlocked for Sam so far. If you cleared your gallery unlocks or don't have art tracking enabled, you can always use the cheats and toggle on "Ungated Gallery", then try to set the alternate art override again. You can choose to toggle off the Ungated Gallery option after if you like (the Alternate option may disappear from the bust gallery if it wasn't there before though).
Let me know if this helps and apologies if it sounds more complicated than it seems, but once you get the hang of how the Alternate image system works, it should be easy to set it for any eligible characters.
