I would say - for these houses - that you might be best with the OFB euromullion expansion set from Marylou. Those are the right kind of windows. I know Shell did some recolours for the doors that made them solid wood (very nifty) and if I remember right a nice white recolour as well. Dark green and white is a very Dutch colour combination.
For the steps - try the concrete steps from uni/base, those are good, or go have a look at Huge Lunatics stair addons.
I've changed the windows and doors and I think it looks much better now, I varied the colour of the doors Lee, they don't all have green doors do they? and varied the steps. Does that look better? I also found some different bricks too. I've added the pediment at the top of the houses but it is 3 wide and my houses are only 2 wide at the top.
These ones are smaller, also I think Marina has pediments as well. I'm not sure if any of them are 2 tile, but there's definitely one tile over-size there.
Phoenix Phaerie's pediments are 2-tile