Yeah, I saw these many years ago. "Hated them", lol! And that hair....!
They used some of the looks for Oracle of the Shi'Ar.
The reason Jean "looked like Tigra" is that claremont was trying to make Jean have an "other-worldly" appearance when she turned into Phoenix.
This "other-worldly" look was dark skin, white eyes, super-long full hair and an energy glow around her. This "other-worldly look" was most notable in: Jean's Transformation issue, when she fought Firelord (red-faced vs tanned face), and in the 2 Shi'Ar issues.
Then, the look changed, as did Jean's powers as Phoenix. In these issues, Jean as Phoenix, had additional powers such as Flight, Space Flight, super-strength and durability and energy blasts---all which had nothing to do with her TP and TK powers, which were also boosted.
To me, after these issues, a change was decided and Jean not only looked differently, her powers were then all TP/TK related with these other powers all but forgotten and she was being led down the dark path towards destruction as Dark Phoenix.