Caption: Confusion
explanation: Use "blank eyes" ・ ・. You can add ; or 〃 to strengthen the effect. The eyes like ￣ ￣ would be suitable too. Finally, you can add such effects as thinking (・・・), raising hands (┐ ┌ or ╮ ╭) and propping the head with an arm ( ゞ).
(￣ω￣;)
σ(￣、￣〃)
(￣～￣;)
(-_-;)・・・
┐('～`;)┌
(・_・ヾ
(〃￣ω￣〃ゞ
┐(￣ヘ￣;)┌
(・_・;)
(￣_￣)・・・
╮(￣ω￣;)╭
(¯ . ¯;)
(＠_＠)
(・・;)ゞ
Σ(￣。￣ﾉ)
(・・ ) ?
(•ิ_•ิ)?
(◎ ◎)ゞ
(ーー;)
ლ(ಠ_ಠ ლ)
ლ(¯ロ¯"ლ)
(¯ . ¯٥)
(¯  ¯٥)