hahaha...
well it wasn't meant to embarrass Maemish...

Your preliminaries are a start..
the latest is getting there..
it is about the depth ..about the amount of information you are trying to squeeze ...tastefully into a crest..
The more you can, following the rules of Heraldry ...the more information you convey to not just the uninitiated ...but volumes more to those who have even the rudiments of Heraldry under their belt...or who wish to...and discover the reams of data buried in your crest.

Point in case.
do the 6 fleur-de-lis have any intrinsic meaning?
or the central cross?
was the placement of the logos and icons deliberate to those quarters and their meanings reflect that?
perhaps the penguin should be "rampant" facing to the left or right?
or perhaps the penguin and the gnu should be more passively demonstrated...say as tearing at their breast ..to signify the parent (os) giving to its offspring, our maemo animal logo...with the pair of them in a "vulning" posture.

the above is just a cursory and casual...not in depth ..
In depth would be much much much more...deliberately specified information ...one could call "Heraldrically encrypted information"
according to the precepts of the art.

Moving the debian logo ..?
that depends...on what you wish to convey..
You do not have to be statically bound by the "recognized official symbol of our time" for those icons.
You can change the colour of the debian logo
That colour red has a specific connotation in the debian logo...you may or may not wish it....specific flourishes depending on where they are put on the debian logo also convey info.
also its location on the crest conveys information.
But you can add much much more depth to just that one little quarter ...than just a logo which just refers to a link ...a familial link of debian to our maemo...

Think of Heraldry ...as something akin to any picto- graphic language.
like say ...egyptian heiros ...
each symbol in their system...meant something, and meant even more when in concert with other symbols...
To the point where...
The amount of deliberately planted meaning in a small space ..
ends up taking so much meaning that it starts running further on its own...past your own efforts..
Thus it takes on a life of its own.
With all such ancient languages ...a lie was easy to see...
A lie was a poor construction...
A lie was an omission from the whole ...
A lie was an "incomplete".
A lie had no life.

If you are not "constructing" or "building" or "shaping" the growth of this Heraldry ...
Then you are just putting ABC blocks together randomly ...
without purpose...
You are speaking gibberish in the language of Heraldry...
No different than randomly putting any words together in any language and calling that a beautiful sentence.

But if done according to the laws of that language..
There will be a point where the depth of meaning becomes so vast as to be considered beautifully sublime ..
as to be considered a living thing that once it begins to speak to the person who is viewing it..studying it...they realize it just keeps going deeper...past your initial intent...

Like a wind up toy...
The longer you wind it up...the longer it runs across the kitchen floor...
surprising everyone with the life of its own and the inevitable directions it takes of its own volition ..regardless of the initial intent and direction of the person who wound it and let it loose.