A nice job there Ed. Those apparently simple uniforms are usually anything but. With so much of the face obscured you've got to get the eyes 100% otherwise it won't work. You've certainly done this.
A nice touch is the can at the back - adds something to otherwise dead space on the base - the enemy of modellers everywhere!
Have to agree, you've nailed it!
A plain uniform is probably more challenging than a highly patterned one, and I feel that you got the transitions between highlights and shadows bang on.
Well done