I have read some sites that say that the Vikings never met the Picts which is literally impossible because there have been many vikings objects found on the Highlands which can be seen in the Edinburgh Museum. On the other hand, I have also read that it seems that Pict and Vikings might have been traders which is highly possible because of the close distance between the scottish Shetland Islands and the Feroe Islands which was an old ancient viking settlement.
There's some great resources out there. Off the top of my head:
Viking Burials in Scotland is a pretty fun website to click through.
Vikings in Scotland is my go-to scholarly reference. It's very nicely illustrated and can be found used for fairly cheap.
Viking Scotland turned up when I was doing this search. It's a bit older than the book above and I haven't seen it, but early academic reviews thought it was a good and pioneering book. I wouldn't turn it down if I could find it.
Combs, Contact and Chronology: Reconsidering Hair Combs in Early-Historic and Viking-Age Atlantic Scotland is a bit more niche but very important. You'll have to find it through a library if you want access.
The Life of Saint Findan describes a middling Irish aristocrat who was captured by vikings and escaped in Orkney. It's a super interesting source that (a) says there was a bishop in Orkney before any other written records of it, and (b) indicates that the bishop in Orkney was neighbors with viking slave traders. The linked edition is a new (and open access) translation of the relevant bits, but you can also read the whole book in an older translation.
Maeshowe's runes - Viking graffiti is a quick look at a prehistoric grave in Orkney that Norse visitors broke into. A unique but interesting site.