I looked on-line, and don't see any photos of them with my search – Google search. I've seen them spelled both ways, e.g. Corvax and Crovax. I inquired with the manufacturer to see which was correct but never received an answer (looks like Corvax is correct given the page link below).
link
Actually, I'd say the photos from this page are quite good compared to some of the others I've seen in the past. You just need to copy, and/or then zoom in to see them better, and these are now numbered, which they weren't in the past. Zooming to 200% size is recommended.
To me, they look like "Tiger salamander" aliens (the shape of their heads) in battle armor, and with ultra-modern laser/blaster weapons. They are 15mm scale, and are very nice, with a variety of poses.
I'd like to purchase more of them myself, and can't recommend them enough, since they are one of the better 15mm Sci-Fi ranges for troops in battle armor.
I've asked the owner/sculptor to create some in 28mm – 36mm scale, since they are so great.
I don't know if he'll ever do that though, since he is a sole proprietor, and has a lot of things going on, with various miniatures lines.
To me, I see these as larger aliens, so producing them in slightly larger scale than those they are paired with would be appropriate, e.g. 30mm – 32mm for 28mm figs, and 34mm – 36mm for 32mm scale, so they are more imposing to their enemies.
I don't see them listed individually on the Micropanzer Facebook page, but do see them on the FB header page – group shot of various 15mm minis. A few of the poses in the group 15mm shot on his header photo for his miniatures are as below – black background (the group shot on the link I provided above is best though).
The Corvax/Crovax are the guys with blue skin in that shot, and in the following positions on it, e.g.:
2nd figure from right on top row with heaver squad weapon;
far right figure on second row with standard rifle;
3rd figure from left on 3rd row;
and, the 5th figure from the left on the bottom row.
Most figures have the standard blast/laser/slug-thrower "rifle" weapon, but there are a few with longer support weapons too, and even one carrying an "anti-tank" or "anti-aircraft" rocket launcher/grenade launcher over the shoulder too. There are also one or two figs that look like squad, or platoon leaders to me.
He used to have a photo of all the minis from this range as a group shot, in a different layout, but I don't see that on-line anymore. The image from the link above is the best one I know of, currently.