If you are happy with what you have leave it be for few days and dont look at it. After few days passed by come back and take a look again. Odds are there will be something you dont like. Getting your scape right can take a week or longer and many rocks moved, broken, rotated, added and removed.
Also, while you may like arches, they are quite unnatural and dont do much coral placement and fish wise. If you look at reefs in the ocean, you wont find arches, but rocks on top of rocks, caves, crevices, lots of hiding spots and so on. I didnt notice this until someone specifically called it out when I did my 1st scape several weeks ago. For some strange reason most of the people that are making their 1st scape end up with arches somehow, and I sure was guilty of that haha