Hi, I'm not able to take a photo of my island set up as I'm visiting dream addresses/towns at the moment. But one set up is
here.
Mine is more like a "(" shape of the trees spaced out on one side and ")" on the other---no bushes, trees, or flowers in the center because it affects the spawn rate of other insects. Without those in the center, I only get tiger beetles and hermit crabs (maybe a wharf roach? I can't fully remember but definitely the previous two mentioned). The beetles and stags spawn at a decent rate in my experience. I placed my trees so I'm able to get the beetles from even a diagonal angle.
As for onsite town tune resources, there's an
unofficial thread by one of our lovely members. :3 They're pretty great and have even done my current town tune (if you'd like to request a specific one).