It's simple, really.
A coat of arms or a badge is supposed to correctly identify its owner in strict heraldic terms.
Decorations only function is, well, to decorate. Which means that many decorations are not heraldically correct and thus cannot be CoAs or badges.
Some of your drawings are heraldically incorrect. I guess the reason for it is that you base them on decorations meticulously replicating all their errors. While remarkable in terms of artistic representation they IMO do not fully correspond to ShipBucket spirit of making everything to the standard and as close to the real thing as possible.
For example the badge of Bismarck you've just drawn. The golden frame is not a part of the real CoA. In fact a frame is a separate heraldic element so by adding it you alter the CoA to the point of being incorrect. Gradient background, strictly speaking, is also heraldically incorrect but that is not a big deal; it just shows that you used a relief decoration for reference
It's like painting a picture of a marble sculpture of a person and claiming that it's a portrait of that person
I'm not criticizing or anything because the majority of people here seem to like your work; it's just a heraldry geek in me speaking, trying to point out some obvious mistakes