Dear Sir/Mam,
I read your project description carefully and understand. But if you want to reduce to around 75 KB, your product will be lost quality and your attached image is 2.07 MB. So, I think, if you want to keep avarage quality, then you should need 90 KB file size for image.
So, what do you think?
Look forward to your kind response as soon.
Thank you,
Noyon.