nice "fins"....btw what are the bad practices..?? can you pls point out..??
as pointed out by spazm for enviromental concerns.
as for freediving techniques:
1. no weights. not a problem for her as she can still sink but energy is wasted in putting effort to go down.
2. also because of the above her neck is hyper extended which can influence equalization and the spine is curved which result in a non hydrodynamic profile.
3. freediving in a bikini. bad as there is no thermal protection and also being a major DISTRACTION!!!
but overall shes good. i assume she got no formal training from the the way she dives. but just imagine her potential if she got some training.