A good tip for beginner-intermediate mappers: pay attention to scale as you're creating.
That wonderful town you're building actually might be only the size of a football pitch...
or perhaps the magnificent Washington DC/London hybrid you've just created is a monstrosity built for giants.
Here's Kalango's Port Victoria, and the aforementioned DC/London mash-up: Note the scale in the lower left.
Now here's rw Washington DC, with its own "Ellipse", same scale: I could fit the White House, DC's ellipse and most of the acreage around the Washington Monument inside Port Victoria's Ellipse.
Here's London for good measure, same scale: The Grassy Promenade is wider than the Thames. Yeah.
I was going to shrink some of this, but maybe I'll just take all of the "royal" buildings and stuff them into the Promenade. Or something.
I mean - it's not BAD mapping per se - it's just... big. Biggie big big.