The import comes with nested groups already created, so you’ll have to start off by exploding them, or diving into their respective edit modes and working from within there.
It’s probably good to keep the coffee cup isolated into it’s own group so that it doesn’t interact with the other line work of the face drawing.
In a couple of areas, I think you could stand to simplify, or commit to a singular outline to define the shapes involved. . . The loose/scratchy feel of some sections is going to create issues with how sketchUp wants to treat those areas as individual elements (i.e. as a unique set of edges and faces)… albeit at the risk of losing sight of the bigger picture of a stylized face illustration.