Okay, I am not a SFB/SFC Mirak fanatic but I'm having a very hard time with this Mirak design.
It looks too blocky and pre-TOS to me. Maybe it will look better with textures, I don't know. I know that I do not like the engines at all. These designs don't say to me "this fits in with FoAs' other ships". It seems out-of-place compared to your other ships/work.
I applaud the effort as Mirak ships are surely lacking in numbers but if I had your talent I'd start with a high poly version of the STOCK Taldren Mirak cruiser as seen on the cover of SFC: Empires at War and then branch out from that design. Nobody, that I'm aware of, has ever made a STOCK high poly Mirak cruiser.
Also if you look at the ST: TAS episode the Slaver Weapon you might see some additional ideas from the Kzinti ship designs. Their ships appeared to be saucers with spherical warp engines.
Having written this, please be mindful that I am still a fan of your work and am in no way trying to offend you. This is just my opinion. MONTY PYTHON voice: "Oh look a [Klingon] ART Critic!"