I would suggest having two hides that are the same (you can use the other ones for decor) one on the hot side and one the cold so Sobek dosen't choose security over thermoregulating. Speaking of, I see you have a stick on thermometer.. they are pretty much no good, and you'll want to avoid any other sticky things (especially tape!) in your viv, as snakes can get stuck and hurt. You'll want to get a probed thermometer for the hot side and also a temp gun to check temps quickly. And then speaking of that, I'm guessing you have a heat mat, is it regulated by a thermostat?
As for foliage, many people get fake plants/leaves from the dollar store. As long as there are no sharp bits, should be fine!
Congrats on getting a beep, they are great fun and I doubt you'll only have one for very long!