
Look at Diala's ear in this image. It looks like a deer ear, or an elf ear or whatever. It has a hole.
Twi-lek females just have cones for ears. This is canon.
Actual Q&A from Rebels Recon with LFL Storygroup's Pablo Hidalgo.
Q: What's under Hera's ear thingies? I'm still unsure on wether female Twi'leks have regular ears or little mini lekku.
A: They have cones. If you look at the makeup effects and what they tried to do in each of the feature films, male Twi'lek's have lobes, ears like you and I. But females have cones. If you look at the actual sculpt it's foam rubber, so it's actually pretty squishy, so as a result you're aloud to put tight headphones, or rapping's or anything over the Twi'leks cones and not have to worry about them sticking out.
Her ears are correct on her hero sheet though.
Haha sorry I noticed this but it's going to bug me now.
