Wells' Martian - the eyes have it.

With his eyes, done that's him finished. As anyone who's read the book will know, Wells is at his vaguest when describing the eyes.
First up, we have:
"... two luminous discs - like eyes". From that we get they have a couple of discs. Not eyes, but discs that could be called eyes. And they glow or are internally lit. Or something.
Then we have:
"Two large dark-coloured eyes". Oh, so now they ARE eyes. And are dark. No luminsosity at all.
Okay, how to do that then?
I've ummed and ahhed all over this build on that very point and, in the end, decided to go with this compromise here - have them large with a very dark brown and black iris centre, but ring it with a bright yellow to try and convey the luminous, disc description.

Wells' Martian - mouth done

Here we are then with the tentacles put in place. The fact that they're elasticated cord means they'll be fully posable when done.
You can also see i've blocked the eyes in white, first step on the vaguest part of this build...