If Indianid, just look at traits like hair shape, overall hairiness with beard and eyebrows, open eyes (high percentages of North Eastern Europeans have more Mongoloid eye regions), cheekbones are typically Europid, no prognathy, no mesognathy, nose is not particularly narrow and high rooted, but has an overall clearly Europoid shape and is prominent, mouth region again untypical for Amerindians, chin-jaw typically progressive Europid.
Is he that dark? Not darker than many Europeans for sure.
So what exactly could be considered a CLEAR sign of admixture (of which kind?), something you don't find in Europe? I'm curious