I'd actually like to add in more variations, just to allow more visual distinctions between shadowling characters, but we'll have to see how far resources from the Kickstarter stretch.
Yay! This is what I was hoping to hear.
I am certainly in favor of variation, if only for aesthetics' sake.
Then why would you vote "No" on this and every other Telepath Tactics poll?
Were those not each specific circumstances? Tastidian uniquely having the horns as far as I recall.
Darkeye has horns too, and for all we know shadowling horns could be as common as red hair or blue eyes in humans.

Were those not each specific circumstances? The bone masks signifying rank within the Shadowling Empire
I am just a bit wary of the use of characteristics like the masks when they're not necessarily appropriate, since that might detract from the integrity of the storytelling with respect to the graphics.
Shadowlings can still wear masks that are not associated with loyality to the Shadowling Queen. The masks just have to be of a different style than the ones seen in previous games of the series.

Scars and other facial apparel are the only variations upon the shadowling I can think of that don't involve new anatomical features.
Besides shadowlings with horns, you can also have shadowlings of different sizes like how Darkling is smaller than Shadowboxer.

Perhaps instead of masks there could be gloves?
I think shadowlings with gloves would be kinda odd. If shadowings are going to use clothes, then I would perfer them to wear bandanas like Niven. This gives them a cool outlaw or assassin type look.

Shadowlings can also wear hats and crowns like Thallion.
*Edited to keep thread on topic*