This might be my personal opinion, but unless you intend to use Dark Hope's texture in your mod then you probably shouldn't use it in your preview screenshots. It'll seem misleading to the players and while it does sound stupid I assure you there are definitely players who would assume Dark Hope's texture is included in your mod based on nothing but your screenshot.
If you are INDEED planning on using Dark Hope's texture, might I ask why? It'll look silly to include a 4K head texture for a single NPC when the goal of your mod is to "Overhaul" the already existing NPCs in the game. You'd either have to give other NPCs 4K heads of similar quality or stick to not having a Yuthura head texture in the mod (You could always recommend player's use Dark Hope's mod without including it in the package).
And for her robe, did you get permission from OldFlash to use the texture? OldFlash disappeared years ago and there (at least to my knowledge) is not way to contact him, did their mod something written in their readme which states modder's can use this texture in their own mods as long as credit is given?