When I first saw the pic of The female that might not be I thought it was a pregnant female as it is rather portly! Or had they just had tea?!!
Female peacock gudgeons/gobies do tend to have that shape, males less so but still that 'just stuffed themselves' look. They hadn't been fed, I fed them straight after I took the photos. I know what my fish are like when there is food in the tank - every photo would have had a streak across it as some fish or other chased down a bit of food. That's how I got the last photo, when they saw me they all clustered at the point where I drop the food in

It is several years since I last had these gudgeons. It was before I had the 125 litre , so before 2006, and I just had a pair in my 60 litre tank. I finally remembered about the eyes after scaring myself when these looked as though they had cloudy eyes. I also remembered about males having a hump on their foreheads and females having a black edge to their anal fins - though the ones I've just got don't have much of a back stripe. And I know that juvenile males have a female shaped head till they mature - I got a trio originally last time but one grew up and turned out to be a male so I took him back. I recently read that males have longer anal and dorsal fins. Two of mine, the ones with lumpy foreheads, do have long fins while the other three, which also have yellowish bellies, have short fins.
Fingers crossed I've got 2m 3f.