Tips on sexing different breeds

[CoconutCoffee]

Been trying to get decent enough photos of some chicks but it's hard so was wondering on anything to look for on different breeds. Specifically:
langshan (white/splash at 8 weeks )
olive egger (7 weeks)
ayam cemani (7-8 weeks)
buff ameraucana (7 weeks)
blue laced red wyandotte (7 weeks)

Most hatched 9/4 and others 8/25

 

[Poultrybonkers]

Got pics?

 

[CoconutCoffee]

Got pics?

A few of the BLRW, buff, langshan, and olive egger. Trying for some of the cemani and others.
Edit: Added numbers and breeds to some photos for easier reference.

 

[Poultrybonkers]

Number 2 looks like a roo rest are pullets

 

[CoconutCoffee]

Number 2 looks like a roo rest are pullets

Pullets in that photo or pullets all together?

 

[Poultrybonkers]

Pullets in that photo or pullets all together?

All together