The middle red guy is probably closest, though the top red is my actual favourite. Maybe because everything else (clothing, sword, etc.) isn't quite so red there.
[edit] By top, I mean the third one. Not sure if the second one on the top is a candidate as well, since it's more a djinni with a sunburn than an efreet.
Yes, it's a difficult choice.
Forgotten Realms Wiki states that efreets
"have red or black skin that is always burning" while the djinn's
"skin tone ranges from pale blue to a more common olive-brown or dark tan".
Too bad their swords are also affected by the coloring, else I would choose one of the two bottom-left ones. Hmm, maybe a pulsating glow instead of a static color will enhance the "burning effect" of their skins, have to test it.
This was already done in Infinity Animations, though we discarded the poorly-implemented colouring effects (they look really bad in bright light or darkness). We slotted new animations for each genie instead.
Yes, I've looked them up, too. But the genies provided by the Fiends&Genies package don't look very different to my color shaded genies (except for their blades which look better).
I thought Djinni had a tail and Efreeti had legs.
This is inconsistent in
BG2. While most efreets have legs, the efreet guardians of King Strohm's tomb in Firkraag's lair have a tail, for example.