The sulphurs do not normally sit with their wings extended, but when they fly, you can sometimes get a glimpse of their dorsal side.
The photo is not clear, but it does strongly suggest a Dogface pattern. More that, than some other sulphur.

"All the common names ... reflect the profile of a dog's head on the forewing. Both sexes are yellow, with broad black borders outlining the 'poodle,' but the female has more diffuse dark markings and a less sharply defined face. A black spot provides the eye."

Picture taken with a Nikon D90, using a Nikon 300mm, f/4.5 lens.

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October 9, 2016.