put rocks around the center mound! like you've done with the mounds on the edges! once that is done, it'll look great. Right now, it is hard to see a separation between the low ground and the high ground. it just looks awkward!
Thats the plan im waiting on the arrival of my stones i still have 25# on the way then i will be planting the rest i will be spliting the hg into smaller portions along with the baby tears mat