nah, no need for a tail there, its got huge ass arms, so it probably walks on all fours with its fists like a gorilla, and can walk on twos for a short while. :O

The whole thing lacks a bit of depth. What would help is if youd put some contrast on the legs and arms, like making the ones in the back a wee bit darker. You should also maybe darken the mountains. Even though they are darker than the ground already, the difference is barely noticable right now

I know, i tried to make tail but with the tail he was looking like... Unanatomical monster tranvestist...

he looks as if hes will soon fall over, with those scrawny legs. maybe give 'em a huge tail to balance it out?