Question

arrange the vessels in picture in decrease of pressure

Answer 1

The height of the liquid in the vessel decides the pressure.  More depth/height means higher pressure on the bottom of the vessel.

The picture is not clear, regarding the heights of liquid in the vessels.

It appears that the order of pressure in the vessels is in this order:
         500 ml, 300 ml, 60 ml , 50 ml
as per their heights in the vessel.