You can sorta tell if the artist is female sometimes, there's just something in the style of a majority of female artists that just tells me "yep, that's a female artist", I couldn't put it into words though, but whenever I get that vibe I'm usually right.
However the artist isn't necessarily the person that made the game, for instance I think legend of queen opala was actually made by a female but the art was all made by male artsits.
Most complete games are made by small teams of at least 2 people, solo development is kinda brutal, especially for 2D games, unless you're using ai art or smth (blegh).