I decided to improvise a sock - plain 2 x 2 ribbing, stockinette leg and foot, Eye of Partridge heel - so that I could pay attention to the sock and knit it as a meditative project instead of "it doesn't look like the picture and I'm a failure." It worked!
I c/o 48 stitches and loosely followed the sock recipe in Sensational Knitted Socks, just to get the numbers right. It fits perfectly.
Now I'll cast on for the second peaceful, dove-grey tigerpaw sock...
(I hope the menagerie will approve!)