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These are truly a very awesome street art work.
The responsible for this amazing portraits craved in walls is a Portuguese artist call Alexandre Farto (known has vulgo Vhils in graffiti culture).
Hes has been spreading all around his talent, with incredible and unique portraits craved in the walls of countries like Portugal, England, Italy, Russia, Colombia and the U.S.
He explores and transforms materials consumed by time and space, walls, metal, wood The result is unique and it challenge the traditional barriers between graffiti and art work.
You can see much more in his website site http://alexandrefarto.com/
Pictures from source below