Anything that could be perceived as a little ray of sunshine - literally or metaphorically.
This could be the sun rays shining through the trees or a child giving you a present. The imagery should be bright and reflect the idea of sunlight. Even if the focus of the image is not about the sun itself, the image should still be filled with sunlight. Quality is essential in this imagery, it must be very clean, in focus, shallow depth of field is preferable but not essential. These images will be used on social media by a global marketing brand to help promote an upcoming video initiative.