Hello @torzio. How are you my dear friend.
I believe that yourDNAportal's predictions are, mostly, reliable, at least in my specific case. Until I was 6 years old I was a child with blond hair. Gradually my hair was darkening over time. Perhaps due to the action of hormones and environmental factors combined, I can not say for sure, although I believe that people with blond hair do not have, necessarily, to be have blue or green eyes. In Brazil it is quite common to see blond people (natural) with brown eyes. The converse is also true, at least in the region of the country where I live. All right that we are a very miscegenated people, which is a great truth, and that such miscegenation was not common in the times when these ancient individuals lived.
As this topic deals with the phenotypic issue of old samples and considering that 'yourDNAportal' is being used as the standard platform to determine the phenotype of old samples from the uploading of VCF files containing the SNPs of these samples, I post below the results that I obtained, both in the free version (which has been used by @Jovialis and @Salento), as in the paid version, the last one containing features that were unlocked by disbursing a specific amount. The objective is to give credibility to the experiment, in an attempt to demonstrate the accuracy of the results obtained.
yourDNAportal paying USD 8.00 for unlock: