vegas backyard plan

Good morning.
It was a beautiful day yesterday and we spent as much time as possible outside. Took a nice long walk and enjoyed the spring flowers.
Here's a few pics of the backyard....

These were from when we first brought the house. Most of the dead  plants have been removed.

It's a small yard, measuring 14 1/2 ft from the back of the house to the wall, and 39 1/2 ft long.
The yard is enclosed by a wall. 5ft high across the back, and 4ft high on the sides.

Here's the plans I did online. The first pic showing what is currently in the back yard.

The large round green tree on the left is the nearly dead apple tree I've mostly cut down. In front of that is some type of rose bush. I'm hoping  to keep the Desert Willow tree on the right, along with the 2 red flowering bushes.

This is what I'd like to have the backyard look like when done.
Extend the patio out into the yard with a sunny lounge area.  Put in a dry riverbed that would extend from the back wall down around the Desert Willow over to the side of the house. That is also how the drainage of the back yard now goes.
Of course, this is all going to wait until we move out there. And also depend on cost and what the landscaper we use suggests. But it's fun to play around and see what we might be able to achieve in that small area.
 We ended the day with Chicken thighs with roasted potatoes and carrots on our grill.
Now, it's back to work. Going to be a busy week!