Gramma schreef
To try and determine my ability against other illustrators, I am thinking
along the lines of entering an illustration into selection for a
competitive exhibition, where the drawings are selected by a panel including
at least one botanist, one scientific member and one research associate
from a botanic garden.

The choice of plant used is up to the illustrator, and this is why I
wondered about a standard format of presentation of just what should be
shown

I guess I will have to use my judgement on the features of whatever
specimen I choose. This could of course be part of what they are looking
for - to see how an illustrator has looked at the plant.

***
What they are looking for may also be how an illustrator has done his
homework, i.e. read up on the plant of his choice and what botanists regard
as the important features.

It may be relevant who the members of the jury are
PvR