It's really hard to say, even someone with 100% density can part their hair to reveal scalp.
Would you mind taking some more pictures with where the flash is not reflecting back straight into the lens? It's hard to tell from your first photos whether that is a lot of scalp showing or just over exposure from the camera.
As others have stated, your hair looks fine; no visible signs of hair loss that I can see.
If you're really worried, keep a record of your hair with regular photographs every few months which you can compare to your "baseline" i.e. the photos you posted here. Try to keep a note of the lighting and match it as closely as possible for subsequent images.