I think that there are at least 3 factors that weight-in on the appearance
of a specimen. The personal taste of the individual is foremost. Secondly, is
the wing shape (design) of the item involved. For example, is it a Prepona,
Helicon, Swallowtail etc. etc. Lastly, are the variables which MAY be present
within the species itself.
As a serious hobbyist/collector I see the examples of my work as something
of an "art form" in its own right. I do my best to represent each individual
in the best possible manner.
When someone down the road looks upon my material they will have a sense that
I had enjoyment and personal pride when I was involved in my "hobby-time".
Below, are a couple specimens of a Helicon species which I recently received.
They arrived in envelopes and after relaxing I looking at each individual as
I prepared them and thus spread each in a slightly different pose; due to that
3rd factor which I mentioned above -- variability within a species.
Now, I happen to think that Helicon butterflies (in general) just look better appearance-wise
with their forewings raised somewhat ABOVE the perpendicular line of the (trailing edge of the
forewing). Others, may feel differently but, I certainly don't think the specimens appear
over-spread.
As to the hindwings you will notice a variance in the distance of the "gap" present between
the fore and hind wings. As you can clearly see the lower specimen has a quite bold band of
silver coloration present at the leading edge of its hindwings. This was something not nearly
as evident or at least greatly (suffused) in the specimen above it.
Hence, I decided that the lower specimen really needed to show more of its stunning
individuality so I lowered its hindwings slightly by 2-3mm; thus showing more of its
hindwings.
Now, personally I happen to like the manner in which BOTH specimens turned out. The spread
is only slightly different but, the manner of their appearance "accentuates" each individual in its
own right.
I know of several very talented individuals here on the forum who (like me) take their spreading
techniques/abilities to another level. As such, I admire the pictures which they share with us and
I too still continue to learn to improve mine where needed !