Reference Pics
I don't know where Sean Tourangeau got his Terran Empire Logo but the Yellow Black Earth with the Sword is not it.
The Mirror Defiant is the normal Defiant mostly stripped down of it's red stripes, Registry and name and then using the Terran Logo as seen on Jenifer Sisko (mirror). The logo Here is black and silver. The Model sported a silver and violet blue logo in these locations.
Actually I think the Yellow Black Earth came from the ENT Episode "In a Mirror Darkly"
In TOS "Mirror, Mirror" It was a (Blue) Uni- colour Earth + Sword
The Logo on Jenifer Sisko is from the Terran Slave Rebelion against the Klingon Cardassian Alliance.
On another Note: I've never Seen that the Mirror Defiant used the appropriate Markings.
Looks like i was too distracted by Worfs Giant NeghVar.