For a baby ball python that small, and for an enclosure that big, clutter is good if not necessary for snakes who are stressed easily/with feeding issues. I think your fake leaves strewn around are apparently good enough clutter for your guy though. If you ever encounter feeding issues, then you can troubleshoot if too little clutter is a problem. Other than what you have, it's just preference and if you like to add what you think your BP would enjoy.
My setup for Cake is like this. Somewhere in between the "rack tub" and fancy decorated setups. Easy enough to maintain, interesting stuff to investigate and climb on, and not too barren.
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