Trees for small gardens

[BooseysMom]

We have a small and wide back garden and want to plant trees to provide privacy as we have windows overlooking us from both sides. It's a new garden which was just laid with turf when we moved here. It's small but nice and wide and everything is planted round the sides leaving the turf in the middle bare and boring. It needs something. I'd like to build a path and pond and dig borders extending out to the middle. We really need a garden designer but have to be careful with cost.
We bought a Cotoneaster naoujanenais Berried Treasure tree from the garden centre and think it would look best as a centrepiece.
We also like the idea of an Acer Norway Maple Princeton Gold or a Liquidambar..see attached. I've never heard of the latter. What do you think? Would these grow to become an issue in 10 to 20 years?
Thanks.

The grand total of 2 pears not years!!

I like the idea of planning on the diagonal. So for example you could have a border on the right that is narrow near the house, and which gets wider at the far end until it covers half the width; and you could mirror it on the left ie wide at the house then narrow at the far end. You want to lead the eye away to the side, not directly ahead to your back wall, and ideally you don't want to be able to see the garden in one glance, you want things hidden behind other things.
The best layout depends on what else you need to fit in.

Allis0n has good suggestions above.

So with that layout, I would put the cotoneaster off centre, because it will be quite eye catching when the berries are out. It looks like a full bodied shrub, so it will occupy quite a bit of space. I would also add trees to take the eye upwards and increase the vertical interest, but as you can guess, I love trees.

Can you post a photo of the garden as it currently is? maybe from an upstairs window? then we can estimate the size and best placement of stuff

Also, how much gardening do you want to actually do?

TheKickInside.. thank you for your ideas. I do like the diagonal idea

Purplewithred..thanks for your post.. DS has taken some photos of the garden. Thrt were taken this morning so part is a shadow. I have placed the cotoneaster where we think it should go but I was thinking maybe along the back fence.

As it's a new garden it's like a blank canvas and I know I'll have to do alot to get it how we want it.

Anyway thank you..ideas very much appreciated

Meant to say..
They were taken this morning so part is in shadow.

Hopeful Bump!