This is very cute—Curiosity's latest "selfie," a mosaic made up of about a dozen images acquired with the rover's Mars Hand Lens Imager (MAHLI) instrument on April 27-28, 2014 (Sol 613) with the 5.5-km-high Mount Sharp (Aeolis Mons) rising in the background. Click the image for a high-res version.
While it's far from a perfect image—there are plenty of discrepancies in the mosaic tiling, I admit—I really like the character it imparts to Curiosity, who almost seems to be giving a toothy (if slightly dusty) grin there with her cylindrical RUHF antenna and a bit of her RTG visible in the lower center.
And with almost 21 Earth-months on Mars and lots of discoveries already under her robot belt, Curiosity (and her team) have plenty to smile about!
Explore further: First color image of Mars returned from Curiosity