Just so you know PsionicWarrior, that Vegeta's hair tended to be Dark Brown in the painted cels for DBZ. Some studios opted for a very dark blue but his hair colour was always a shade lighter than black. Raditz always had dark blue hair, Yamcha sometimes was given dark blue hair as well, and Vegeta a dark red/brown and sometimes dark blue or a dark grey. His hair colour in the anime was nearly never painted black and you can see that in nearly all the cels available:
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And Raditz:
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It was said in the manga that all Saiyan hair is black, but the DBZ anime obviously is more liberal towards the definition of what Vegeta meant by black hair colour: Saiyans, in the anime, can have dark hair that might look black but is actually dark shades of brown, blue, green etc.
And yes, that screenshot of Vegeta, his hair is not black if your screen is properly calibrated:
However, Raditz, Yamcha, and Vegeta all had their hair appear darker or pure black due to TVs having an output that cannot show all the colours and shades of said colours. Many times, TVs will crush colours to black if the colour or shade is dark enough. A computer monitor and your eyes are different however, and can display much more levels of shading and colour than a TV.
Getting back on topic, I think one of the wierdest choices was to change Goku's skin colour. It's never really explained, and his Super Saiyan forms have his colours return more to form in GT. Is he tan because he's been in the desert sun with Uub? Was it because Toriyama coloured him tan a few times (and a few times not tan, mind you)? Everyone else had roughly the same colour palette other than Goku. Bizarre choice.
Again, I think the overall colours and designs look much different than its predecessors. The constant pink hue and strange design choices just make GT stick out like a sore thumb.
On Super, I cannot get over how Hit looks extremely phallic. His colour choice doesn't help either.........
My favourite art style (and animation) outside Toriyama who worked on Dragon Ball: Katsuyoshi Nakatsuru, Masaki Satō, Minoru Maeda, Takeo Ide, Hisashi Eguchi, Katsumi Aoshima, Tomekichi Takeuchi, Masahiro Shimanuki, Kazuya Hisada