The paint container use the same method for the metal part (upper tank part). The tube inside is again a BezierCurve with an BezierCircle. The Glass Tank is a cube with subdivision-modifier, a few Loop Cut and Slides to give it a rounded shape.
All you have to do now is to set op the background and the lights and so on...
Here's what it looked like in my preview window. I used 2 planes as a light source (set planes material to "Emitting"), a sphere as environment. I choose a light green color.
Finally, render the scene in "Cycles render" mode.