Beginner Gardening: How to create a good design for my garden, 1 by strilets

strilets wrote:
about 3 month ago I moved to a new house. There are fruit trees on the backyard - an apple tree and 2 plum trees.
very good area,
I also think that will be great to turn it into beautiful garden...e.g. build arbour and do some landscape works to make it's look better

I started from searching help in Internet and I found a 3D tool where I could create my backyard to see how it will look if I will decorate it

here what I've got http://mydeco.com/3d-design/garden-design/1292773/

I would like to ask you about feedback or advice on how it could be improved?