I've found with my panda's that the females are bigger and slightly fatter - not massively so it's not be that noticeable. If you have one or two that are bigger then they are likely the females. I can only tell my females from the males when they are sat together but with my peppered cories the female is really obvious as she's really rounded and noticeably bigger.
As to the eggs - they are small and white to begin with. They darken in colour over 3 or 4 days until they are a very dark grey/brown. Mine tend to lay them in clusters of 3 or 4 but this does appear to depend in the maturity of the female. A young female tends to only lay in one's and two's. You may see them scattered across your glass one morning or attached to leaves
As to the eggs - they are small and white to begin with. They darken in colour over 3 or 4 days until they are a very dark grey/brown. Mine tend to lay them in clusters of 3 or 4 but this does appear to depend in the maturity of the female. A young female tends to only lay in one's and two's. You may see them scattered across your glass one morning or attached to leaves