So I just looked up the Beaker folk because of what you said since I've never heard of them. Found an interesting article about a skeleton they found in a grave in Scotland that they've named Ava. The person who did the facial reconstruction gave her red hair and blue eyes. But after a DNA study, she was given brown hair and eyes. It's odd because the beginning of the article says that they migrated from the Iberian Peninsula. If that is the case one would think that it should have been obvious that she'd have had dark hair and eyes.

https://www.thevintagenews.com/2019/02/08/story-of-ava/