Splash guard around the house - tips

I simply ordered too much concrete and my dear helpers wanted to use it so that everything holds well

After the concrete cleanup, it looks like this ...

A thousand times better

It was worth it after all. In my opinion, this is sufficient.

That would have been my question now....

So can I fill in the gravel now?

By the way, the question of how I should handle it? Does the gravel have to be of the appropriate size so that nothing falls in? Because it would be covered...

Don't forget to lay down the foil to protect the wall.