So, how big is a door?

It's very easy when sketching out building designs from photos to make assumptions. One of these is that you can use a door as a visual  gauge, doors being around 6'6" high and 2'6"-ish wide. Err..no.

The photo is in the main street at Orford and as can be seen the rather nice row of cottages are built to 3mm scale, while the 4mm Mrs F. (at 5'2"" in flat shoes) towers above the door frame. The question is: if you built these to scale, would they subsequently look wrong and underscale? Would it therefore be better to add a little licence and up the sizing a little?