Star Maker - Quasi Human

I wanted to have a try at an entirely digital painting, as I usually hand-draw and then scan before painting anything. I still haven't got myself a graphics tablet, so I've avoided completely digital work simply because it's somewhat awkward using the mouse touchpad on my laptop.

This is how I imagine one of the 'quasi-human' races described in Olaf Stapledon's 'Star Maker'. I'm planning on adapting the book into a graphic novel some time soon; I've done a few sketches and planned out some more abstract ways of visualizing things, as there's a great deal in the book that couldn't really be illustrated conventionally. Should be fun to attempt it, though.

Here's the description of this race from chapter 5, 'Worlds Innumerable' (pages 70-71) :

"On one very small but earthlike planet we discovered a quasi-human race which was probably unique. Here, though life had evolved much as on earth, all the higher animals differed remarkably from the familiar type in one obvious respect.
They were without that far-reaching duplication of organs which characterizes all our vertebrates. Thus a man in this world was rather like half a terrestrial man. He hopped on one sturdy, splay-footed leg, balancing himself with a kangaroo tail. A single arm protruded from his chest, but branched into three forearms and prehensile fingers.
Above his mouth was a single nostril, above that an ear, and on top of his head a flexible three-pronged proboscis bearing three eyes"

I should add that the 'three forearms and prehensile fingers' could well be interpreted as meaning three fingers on each forearm, but I've decided on tentacle-like forearms instead.