It'll help if you have deeper substrate. Yours looks quite thin. I recently swapped my gravel for play sand & have 2-3" deep. The fish are having way more fun with the sand now & plants have deeper space to grow roots. You can find good lists for beginner plants - for me Elodea, water wisteria, java Fern & java moss, Limnophila sessiliflora are all easy and some fast growing ones too. I add Seachem Flourish Comprehensive liquid fertilizer weekly & some root tabs that last several months. That way plants get nutrients they need. They'll also gobble up excess ammonia & nitrate so act to clean the water too. I think your skull would look really cool peaking out if some long green leaves. Frogbit or Salvinia floating on top will grow quickly use up nitrate & help provide shade for your fish. Another
@AdoraBelle Dearheart tip is to raise water level to meet the black rim. It makes a big difference to the look of the tank & how the light filters through.