I'd suggest you look through the Southern Cross book again, as nearly all primary art for that book is by one "P. Simon," and his stuff is largely garbage. What little artbook there is in there is small and mostly multiple-angle shots. Unfortunately my Macross RPG book is nowhere to be found, but I can assure you you're very wrong about the Southern Cross artbook.
Furthermore, Art 1 has a TON of character lineart, something the RPG's barely even feature. Not to mention a lot of color artwork, the Southern Cross and New Generation sections are a bit lacking... but overall you get a lot more artwork for your money.
There might be, but you've yet to find any decent ones.