after looking (at), having looked (at)
Посмотрев на неё, он покраснел.
Looking at her, he blushed.
Посмотрев на его лицо, ты мог бы сказать, что он обеспокоен.
Looking at his face, you could tell that he was worried.
Том выскочил на дорогу, даже не посмотрев по сторонам.
Tom ran into the road without even looking both ways.