What is a good way to decorate a backyard that's not leveled?

Plant shade OK ground cover. The shade and tree roots will make it difficult to grow many types of plants. Use bark chips if you want a good look-expensive for the amount of ground to cover.

I'd look into some native woodsy plants. Check with your state or local forestry or look on the internet for plants that are hardy in your area as well as native as they will do best. Once you've done that I'd look up the plants to see their habits (How big they grow, how much care they take and how much water) Natives will do better but they still have some preferences and requirements (how big they grow so you know how much space they need).

Now, walk around and pick a place where you might want to put maybe a dogwood then plant some azaleas around it and maybe some ferns. Or maybe a mountain ash that gets berries on it for birds in the winter with some hostas at its base.

Your yard seems to have a couple of sunny areas, you might try digging a couple of areas enough to level them or build retaining walls on the lower sides and fill for some plants that like partial shade to full shade plants. Hosta likes shade and there's many different kinds.

Put in some stone or wood walkways with some steps for easy use (to tend the plants - water, trim, feed & weed) as well as for interest. Look around and see if there are some interesting stones that you can place in amongst some of the plantings. Put in a bird bath and feeders and maybe a bench or seat that you can sit on and enjoy the fruits of your labor and watch the birds

It's hard work and expensive so take it in sections, don't try to do it all at once or you'll get tired, frustrated and quit. Besides, as you become more experienced you'll think of new things you want to try.

It's going to be HARD work but when your done you'll look at it and feel a sense of accomplishment, like it and enjoy it.

You can divide by making different level. Our yard had a slope down to patio area.

I would level the entire yard.

We live in a multi level yard. We used bricks, pavers, rocks and a lot of back breaking work that my husband did, DON'T GIVE UP.

PS, looks like you live in Flagstaff, we're in Sedona. Lots of red rocks, adobe dirt, and lots of ingenuity. We have roses in the front with bulbs so the Javelinas can't get to them. Then there's the Bobcats and Deers. Love the Deers, not too sure about the bobcats.

What a wonderful opportunity to create different levels of usable space. You have a nice large yard with shade so think "big" areas. One for cooking, one for seating, one possibly for a water feature, another for a play area if you have children, another for storage (she shed/tool shed), and one for you favorite flowers and shrubs. Embrace the outdoors and have fun.! Best of luck,