Interesting topic. I have only few that match the topic; many more if pix of dogs can be considered portraits. But here's one that, if all goes as planned, will be used on the back cover or inside sleeve of a book a friend of my wife's is writing about marmalade.
Pentax K-5 used @ 1/180s, ISO 100 -- Sigma 70-200mm f/2.8 (the HSM, non-OS version) used @ 110mm, f/6.3
Another one that was considered, but we didn't go with... (thus didn't get the same level of softening as above)
Pentax K-5 used @ 1/60s, ISO 100 -- same Sigma zoom used @ 135mm, f/8