Besides the fact I don't know why Pert would have tubes coming out of his head outside of terminator armour, I really dig that pic. Power armour is fine, but the "big space marine" look for primarchs never really captured their grandeur for me. He looks like a true war leader and conqueror in that shot.
Rogal reminds me a lot of his first appearance, for whatever reason:
It's funny how diverse viewpoints on how characters are handled can be. For me, French's Perturabo has had one of the series' best arcs, and from The Crimson Fist to Tallarn to Slaves to Darkness has been pitch perfect, with Angel Exterminatus being fluff and Hammer of Olympia being interesting but peripheral. French's Pert has always been exactly how I pictured him after reading his wiki entries. But I know there are also those who see the literal opposite, and are hardly any less valid.
I'm glad French has got him again in Solar War though, I tell you hwat.