Sure, the image is a bit dark, but trust me, the guy has blue skin.
Gunn had this to say about the character and the actor on his Facebook page:
#gotgpicoftheday Michael Rooker onset as Yondu. You’ll be seeing more of him soon. Yondu was not in the original script. I added him and wrote the role specifically for Rooker. I wasn’t sure Marvel was going to go for either idea, so I was relieved when they responded enthusiastically to both.