The Curse Of The Red-Headed Mummy
I notice in the article you posted a reference to the Picts being related to the Scythians. I actually believe they are closer related to the Xiongnu
Oetzi the Iceman also has tattoos...they are made at well known acupuncture points.
The information about the Xiongnu is also interesting. I don't know much about them, but Scythian influence seems to have spread east into Iran and Russia as well as west into Europe, so the possibility of the Scythians as a common point of diffusion between the Celts/Picts and Xiongnu might be explored. Here are a couple links discussing hypotheses about Scythian influence in Iran and Russia:
ETHNIC ROOTS of the TATAR PEOPLE
On a related note, I'll also mention that the Norse epic writer Snorri Sturluson records a tradition tracing the origins of the German/Frankish/Norse tribes to the Black Sea, where the Scythians originated.
On Oetzi, I'm trying to find a link which mentions exactly where his tatoos are--do you happen to have that information? I know something about acupuncture, so I'm curious at which points the tattoos were made and what that might entail about their significance.