After Level Up the portraits don't look like before but similar to what they looked like in EA. Just a frontal shot of the character and not even centered.
(Steam version, Patch 8)
I posted a thread on this one on here (and on reddit).
According to some, this is not new behavior - but I sure thought it was as I had never seen this happen on any of my play-throughs and only ever saw it when I was watching patch-8-stress-testers' YT-streams of a pre-release candidate.
On my first patch 8 run (release version), it happened right away upon first level up on the beach (SH's portrait glitched). Then it happened again when re-spec-ing SH and Lae'zel once Withers was available. It "fixed" itself during the "natural" level up from 3 to 4 and it doesn't seem to have happened again since (party leveled to 5 in the meantime and I re-spec-ed Gale once with Withers). Though I did see Astarion's mini-portrait as just an empty frame with a black surface inside when I first pet the Owlbear at camp and got Astarion's approval for it. His portrait in the camp-chest menu looks fine, but since he's never in my active party at this stage, he may have glitched out without me noticing it.