Add a LED flickering light from a chep led candle (5mm LED) and  a CR2032 battery to light up the jellyfish head. If you use clear filament and slim perimeter/infill, it can light the stem and even the tenticles.

You can get the candles from 99p store or Amazon  - https://www.amazon.com/Electric-Operated-Realistic-Flameless-Tealight/dp/B07CZVTW35

Printing needs supports from buildplate.

Current version has no on/off switch so a bit inconvinient ;)