not really; yes
for example:
Fiend
Otherworldly beings of terrible power, fiends are physical manifestations of evil and corruption that exist to inflict pain, fuel hatred, or spread despair. They are universally violent, greedy, and perverse. Their greatest pleasure is to tempt mortals to become as depraved as they are.
Fiends appear in countless forms, although their physical characteristics often reflect some sin or other vile aspect. For instance, a fiend of gluttony might take the form of a corpulent humanoid with an insatiable appetite, while a fiend of decay might manifest as a black, skeletal creature with a foul, rotting stench.
All fiends are outsiders. Use the information about outsiders (page 222) to create new fiends.
{disclaimer - that was not meant to infringe on the SRD, OGC, OGL or any other somesuch. it's merely meant to intice danzig138 to buy this book

}
...and then the species traits follow, just like the SRD
the pictures of the monsters typically follow an example of that monster with PC levels: the gnoll pimp example is a 'gnoll strong hero 2', whose stats are in the SRD, the medusa charismatic hero 2 looks like a PR rep, and so on