I think I found it.
Here's a larger view of the album cover:
Here's a British Cruiser Tank Mk1 CS with 3.7 inch howitzer turret gun:
Same 2 hull MGs - though the artist didn't quite get the weird mini-turrets right. Same main gun/MG arrangement in the turret mantlet - with what I presume is a sight port on the side opposite the MG.
It's even got the same numerical designations as the painting of a tank.
Not exactly what I would have chosen to epitomize TANK-ish power, but what the hey !