Hi,
I have experience in sculpting in Zbrush, and since you already have a base model, and concept of what you would like, I can get the bust sculpted for you by Thursday 12:00am EST. I want some wiggle room with 4 days, so I can send you images of the work so you could let me know if I'm capturing your vision correctly. Would you want the final model in a Zbrush project file?
Thank you,
Samuel