what effect is this?


increase contrast, desaturate... Really very basic.
 

look like the tone being casted is abit warm/reddish. something like a duotone and tweak with saturation.
 

look like the tone being casted is abit warm/reddish. something like a duotone and tweak with saturation.

Yup, this can be done either via split toning or tweaking colour temperature