These are all gorgeously breathtaking! I'm loving all of these new external artists. All of their work is so inspiring and ideas immediately hit me each time I look at one of their galleries even if I can't properly use the picture with my ideas. I really like Swamp-Grat Rider. It looks very reminiscent of a Rat Brownie warrior. I'll have to file this one away in case I ever work with Rat Brownies or see a nice place this might fit.
I also wonder if Wayfarers might be able to be used as a Brownie pic somewhere, such as for the sea-faring Brownies that Coren and Rookie have vaguely mentioned over here (the massive teal text at the bottom of Rookie's post). The coloring of the would-be Brownies doesn't really match the current physiology laid out for the Race, but I'm sure a reason or alteration can be invented if cleverly done, like with Rookie's Darklings. I'd be very reluctant to ask about a recoloring at all. There appears to be a certain inhuman quality about them though, with the odd facial structures and limbs being unusually proportioned. I do think that perhaps the one on the left could possibly be seen as a very light brownbark, and the shorter one might be able to pass as a birchbark?
As they are in Nybelmar, I think the goggles can be morphed into a primitive eye protection from the water, Brownies being the wonderful little geniuses that they are. They could be construed as standing on a branch with the rising moon as their backdrop (although I worry that the planet in the image is too large to be considered a moon :/). That looks like it could be sunset.