Think Richy looked every bit as surly today and against West Brom (while putting in great shifts).
To me it seems to be representative of players that aren't satisfied with performances (Kean) or outcome (Richy), not necessarily just "sulking". Even Gordon with him being desperate to score. Last week Kean knew he wasn't playing well and the penalty was a gift, from someone else's good work. Again tonight, he finished off a smart move from Digne and Nkounkou. It was a clean enough finish, but pretty much his only decent involvement.
With Carlo and the new arrivals, the pressure has ramped up and there's more of an attitude that near enough isn't good enough.