Is your subjects head in the photo more than an inch long?
Does your photo have light and darker areas?
The subject isn't squinting in the photo?
Does the subject have reasonably neat hair,( if the subject has hair)?
Can you see a gleam in the subjects eyes?
Does the subject appear to be smiling?
Can you see the colour of the subjects eyes?
If you can tick 5 or more of these boxes then you have a photo good enough to send.