Spotted this on the side of Taylor Taylor (Portobello Road, W10), it’s a stuck on creation rather than one done with spray paint. I’ve left the image at full size so click on it to view a larger version and see all the details.
On the way home I also spied this sneaky sticker by Fauntleroy Snooty, located on the Harrow Road at the junction with Ladbroke Grove (just in front of E.M. Lander Memorials). Like this? You might also like Street Art #55 and Street Art #76.