Can you help me with the order of the adjectives? I want to describe a large trash container that looks like THIS. This is the order I have used. Is it correct?
It was a rectangular (by the way, is it really rectangular, or should I use another shape?), metal, gray, wheeled bin.
I'd say "It's a large, grey, metal wheelie bin". (We call it a "wheelie bin" in the UK, not a "wheeled bin".) I wouldn't bother mentioning the shape. Not only is it irrelevant but once you've said "wheelie bin", most people will already have a mental image of it.