I don't know if I can work with such subtle things with anyone even noticing at that size.
Or what kind of tattoo makes ambiguous things appear more feminine or masculine. Please elaborate.
Well, he probably just meant that the male and female sprites were too similar, and gave you some quick ideas. Tattoos can have any meaning you want them to, as long as you let the player know what they mean through dialog or whatever. You can make the tails shaped a bit differently; thinner for the women? The hair you could make a bit finer or longer, I guess.
I don't think it's a huge problem, though. If I had to guess which was male, and which was female, I'd be able to already. That said, the girl isn't especially feminine looking, either. If you told me she was a guy, I wouldn't object. It's up to you whether or not that's okay. They
are lizard people, so you might not care about making the women especially feminine looking, hahah.
The girl does seem a little unfinished when you look at her next to the guy, since she only has two skin tones instead of three. But you said "progress," so I'm assuming you're still working on her?
Good sprites, anyway. I think they're gonna look really cool when you animate them. =)
Also, thanks for the "no blurry pixels!" link in your sig. That's awesome. =D