I see the other two pictures now. Although blurry I can make it out better.
On the left side of the carb, which is opposite of the throttle arm. The large screw like thing is the high speed needle. Right in front of the high speed needle is the low speed mixture screw (it is a airbleed carb design, similar to the OS carbs like it). Now just above the throttle arm is the idle speed screw.