If you put hand branches together, be careful, remove any higher points with something sharp and use tweezers to push them inside, it will be little hard to get them in, so push hard with tweezers.

No support!

Probably do not need any infill at all, but to be safe, use 5% gyroid.

Branches are very delicate, so be careful. Also 0.6 nozzle is already a bit too big for them, but printable. 0.4 Nozzle is fine.