I need help for a mic preamp project

hi guys

i have as a final year project to design and build a mic preamp. i choosed to use solid state topology for my project with the use of NE5534 opamp. my design has no transformers and it come in three main parts
Differential input
Variable gain control
Differential line driver
it's a 4 channel and it's supposed to be suitable for studio recordings
I am near finished it and i am in the stage of writting the report and i need some help about what i have to include. i hope that you as you are more expert and have more knowledge at audio engineering can help me by giving me some tips what i have to include because i'm really stuck with the techniques that are out there for line level amplification.

Thanks for reading
Im open to any advice at all.