Important: One thing to note up front here is that not all images actually have any areas in them that are supposed to be neutral gray, and obviously, you can't find what's not there, so if that's the case with your photo, no technique for finding midtone gray will work.
Unfortunately this colour is much more true to blue than green. I now have a soft turquoise but washed the colour out after only 10 minutes. So I'll be surprised if it lasts for more than 2 weeks. Overall I think the Joico colour has great pigment but don't go with the colours you see on the package!!
Although each agency is different, generally, you will hear from the hiring agency in about 15-30 days after the job opportunity announcement (JOA) closes. If you have not heard from the agency, you should contact the agency that posted the JOA to inquire about the status of your application.