I read it Phil.
I just think the info is all there...and I do think there is resemblance...the facial shape is the same, can't tell anything about the nose and ears, but if you look you can see that the circular inner part of the ear matches on the right ear in Mark's photo of him with the circular inner part of the ear on the left ear in the postcard...the amount of space from nose to lip is the same. There doesn't seem to be many photos of Wilkinson out there so you can't find anything that has the same angle which you need to do a good facial recognition comparison.
Also no one has come up with any links to anything about anyone else ever managing the Hopkins lady team other than Wilkinson.