Plant selection help

We have a massive cut to fill platform on the side of a hill that has left us with all clay and rocks on both the cut and fill side that we want to plant out some how.

I only have this poor quality photo that shows the steap rocky/clay areas we want to plant out.



But we are looking for ideas as what would be the best way to make this look a bit more appealing!

Initially we was thinking of bringing in a few truck loads of pine chips or mulch of some sort to cover all the clay and then just gradually plant it out with ground covers and shrubs of some sort??

Any suggestions?

This photo shows the cut side a lot better to give you and idea of what we have to work with!!