At this age, you cannot tell a black sex link male from a pure BR male, but considering both chicks pictured have lots of dark down the leg fronts, they both, from those pics, appear to be pullets. The pics are really not the best to judge by, though.
http://www.dominiquechicken.com/Sexing_Dominique_chicks.html
This link is good for Barred Rocks, Cuckoo Marans and Dominiques and has very good photos.
http://www.dominiquechicken.com/Sexing_Dominique_chicks.html
This link is good for Barred Rocks, Cuckoo Marans and Dominiques and has very good photos.