Originally Posted by Etruscan
Excuse my ignorance but are these both legit adverts or something?

No. The top image isn't even from BG2. IIRC it's actually the original cover of the 2nd Icewind Dale novel, Streams of Silver.
[Linked Image from static.wikia.nocookie.net]

You can clearly see Bruenor, Drizzt, Wulfgar, and Regis here in the art/book cover and not anyone from BG2.

I'm not sure where the bottom image is from, but from what I can tell it doesn't look like official promotional art for BG3 (it's not using any of the actual promotional renders).