I'd pull the rock away from the glass as it will make cleaning the sand much easier.... Also depending on what kind of critters you want a "cave" or shaded area would be welcome... I personally like arches ice attached my 75gal scape for reference though I'm no professional.... Finally if you enjoy reading you can look up photo composition to learn about balancing points of interest so the rocks help the eyes explore the entire tank or these videos helped me
Unless you are going to add more rock, I would probably break up some of those (mainly round), rocks to give you more interesting shapes. You won't be able to do much with what you have, other than just pile rocks up like boulders. That being said, once covered with coral, you won't even see the scape anyways