Thank you all for your comments.
I realize now that I should have stated that I did/do not intend to have them that large on the web page. My bad. I just like to give them some "face time", (warts and all) when they are with friends.
Certainly what is designed to work at 1 centimeter can't be expected to always translate well at 10 times that size. The opposite is also true. Fingers and thumbs are obviously missing on the large scale images, but such details are lost at the scale of the game.
Case in point:
What I do not like is the person on the left side: It is nude, it has a strange skin color and the bald head does not look really good. Should it represent the Atlantean tribe? If yes, do they all look like that (I have never seen a big picture of an Atlantean worker)?
Yes, the members of this mysterious race all have a similar skin tone and most of them have light blonde hair and go bare-chested. The men wear their hair in queues (pony-tails) and typically shave the rest of the head including the eyebrows.
The green eyes of all three look strange. The white should be visible.
You can barely see that they HAVE eyes, let alone whites of the eyes, at the scale in the game.
I do not intend at this point in time to refine the images for realism at these large scales.
At the same time, I do not think we need to abandon the idea of using the workers in the icons. Bear with me while I cobble up some more examples at a scale I would suggest for their presentation to the public at large. Something closer to this, say:
If they don't meet expectations (and they may not), I will gladly pursue more symbolic images without the workers in them. (Of course, the little guys will be very disappointed.)
I see little people.