Here are a few character designs for a Alternate Mirror Universe to that of what was portrayed in DS9. In this Mirror Universe the Empire is alive and more Dark than it was in the TOS episode Mirror Mirror.
The Empire never fell to the Klingon/Cardasian Alliance. Instead it destroyed that alliance and went on conquering the universe.
Here is the Command Crew for the I.S.S. Titan
Captain Riker.
Yes that is a Borg Eye piece, but he has not been assimilated. The Terran Empire has engineered modified Borg Tech to be used on personel and equipment.
This Borg implant can be remove when ever Riker wants to. The Implant ties into the Titans Tactical and Weapons systems to give him greater control over his ship.
Commander Deanna Troi. As with the Federation version she is Riker's wife. She also serves as political officer.
Commander Geordi LaForge.
In the normal universe Christine Vale was given the First Officer posting, but in the Dark Mirror Universe Geordi took it. He to has modified Borg Tech as well as occular implants that Tie into the Titan's systems.
Lt. Commander Tuvok. Science Officer and Second Officer.
Lt. Christine Vale. In the normal Federation Universe she is a commander and first officer of the U.S.S. Titan. But in Dark Mirror Universe she was not offered that posting, but She was made a full LT. and is head of the I.S.S. Titan's Security Teams.
*Note: Most of you have seen these from older images that were posted in my gallery. I have updated/ redesigned their uniforms, combadges & rank insignia. So I decided to group them into one shot.
There is too few Mirror Universe art out there. I really like your technical approach to this (saw the rest of your gallery.) It fits so well in the established designs. Very cool.