Is my baby iguana sick ?

If you don't already have one, get him a UV light for his cage, they NEED UV light. Sneezing is normal, it's they're way of getting rid of excess salts in the body, my iguana does it all the time. To make his skin brighter and greener, get a UV light( if you don't already have one). His eyes look bright and alert. You can put a basking log in there that he can climb on to bask. He doesn't look to sick to me, but if you're still not sure. You could take him to a vet.