A notable characteristic of armorial depiction is that any illustration of a given design is considered to be heraldically equivalent. For example, any illustration of “Gules, three lions passant guardant in pale Or” is said to represent the English Sovereign, no matter in what style the lions are drawn, as long as they accurately reflect that blazon.
Konstantia Kaloethina has assembled a nice demonstration of this principle in her “Heraldic Mythbusting” blog post containing nine different illustrations of “a seraph proper” by six different artists.
Two seraphs proper; the first by myself using an illustration by Vinycomb, the second by Konstantia Kaloethina. (Shared with permission.)
In addition to these illustrations, the post provides some period examples of “artistic license,” explains some boundaries on when it’s taken too far, and discusses the Society’s heraldic registration policies — it’s definitely worth a read.