hmmm first girl doesn't look like Helena at all, second does resemble Tina, but boobs...Tina has like the biggest boobs in the game but here she is outnumbered. And Lisa is dark-haired.
These sure don't look like dead or alive girls. The one in the middle slightly emulates Tina's facial features, but Tina's supposed to be the bustiest character in Doa. Also why would Tina have a dagger strapped to her leg? And the one on the right looks a lot more like Elena from Street Fighter than Lisa. The one on the left doesn't really look like anyone I've seen before... she's quite hot though. :P
So yes, they are Dead or Alive girls. But as to which I dont know.
Pixiv tags on the left of the picture are tags for an artist's gallery, not the picture present. If you click any other picture on his gallery, the tags stay the same. He has DoA pics in his gallery, is all.