Seeing as though you asked
I'd strip out the gravel and add sand. But then I always hate the fake looking coloured gravel.
I'd then strip out the ornaments and go with a much more natural look, ocean rock, or other stones, or perhaps even wood.
But this is just my 0.02 and I personally just hate fake ornaments etc
What you've done with it if you like it isn't actually all that bad.