E-mail me the absolute highest resolution version of your photo, digitally scanned for the best results. A photo of a photo will lower the quality, and the transfer process to fabric will lower it a little more, so starting with the best quality photo gives me a good starting place!
If you have any ideas for the background or embellishments (meaningful elements you’d like included), let me know in your e-mail. I will do a bit of interpreting based on the composition of the photo, the pose of the subject, and how close-up the portrait is.