Front needs a faux bumper bar, and a bit of re-arranging. Mentioned that in the "change the front grille design or leave it as is?" thread.
Rear needs a slightly less black diffuser, and a little bit better balance between the tail light black panel, and the visual height of the bumper bar below it. (the tail light section is thin, then there is an enclosed area with a crease around it, but below that the bumper is a bit too thin vertically, compared to how far it extends past the tail lights, with a lot of black area underneath. The black area is good to have there, but it cuts a little too high.
The headlights need to decide if they are going to be edgy or round... I get the theme of the old S30 and S130 headlight covers... but they seem a bit confused as to what shape they are trying to be on the Z35. The S30 and S130 were body-color inside the covers, except for the sealed beams themselves.
I like the katana trim and the black roof... but I am almost wondering about alternate options... like a gray katana trim finish, body color roof rails, and only the center roof panel between the windshield and rear hatch blacked out.
Or possibly some lighter color treatments on the roof rails, A-pillars, and rear hatch,
like a silver roof over a copper orange, or emerald green body color... or a copper orange roof over a medium gray/silver body color like the prototype Nissan Kicks was introduced with.
I'd love to see a smoother hood. I know the detail in the hood throws back to the S30 and S130, but is almost too prominent here. An S130 280ZX Turbo NACA Duct and vent combo in the hood would be interesting. Even just a smoothly compound curved hood like the Z32 would probably be fine.
However, don't get me wrong. I think the car looks quite good as-is... but I think it could look fantastic.
It is the most interesting car under $50,000 in a long time. not quite Ferrari Roma gorgeous for the front-engine, RWD 2+0 Sports/GT fastback coupe, but probably about as close as mainstream is going to get, for 15% of the money.