As an example, here are two of my snakes in a "normal S" position... they are both SUPER docile and have never attempted to strike, so these are clearly not aggressive moves.





I don't have any pictures of striking positions to compare, which I should say is a good thing. But they generally tighten up before striking, and sometimes lift their necks vertically - almost like a periscope pose. Believe it or not, you'll learn to read their expressions and body language as well. Oh, and I agree the snake needs time to settle in, and you probably shouldn't bother him until after a feeding (or two). Once he's feeling secure you can start handling him, and I bet he'll become a lap-snake in no time. Good luck!