It will be to your benefit to have a facial, waist-up and a full-length photo, that internet personal will make the point. This covers all the angles and leaves no questions about your physical appearance.
On the contrary, you will harm your internet personals image if you post a group photo. Imagine a group photo and a capture to it ? ?I'm the third from the left in a white shirt?. Well, but the one on the right is quite stunning as well. You are posting your internet personals image because you want to draw someone's attention to you in particular.
That is, if the picture is just of you, then you have 100% of the viewer's attention. But that won't happen if the person sees a picture of a group, his attention will extend over the whole of the group and might even skip the main character. You only have a fifty-fifty chance that you are the one that the viewer is attracted to and hence, interested in dating. You post a picture but could quite possibly eliminate yourself as the object of desire.
By the way, there might be someone in the group who is more attractive than you. And if your image is lucky to receive the viewer's attention, he/she would get only a vague notion of your appearance ? you are too small among all your mates on the photo. The same result is achieved by a photo of you wearing sunglasses that cover half of your face. And that is not the effect you counted to produce, is it?