I have a photo permission form which has tick boxes to cover all sorts, one being for my website. The parents tick which they are happy with and sign it. Out of 29 children I've looked after, only 2 didn't want them on the internet. I'd have been fine if most had said no, but as they haven't, I've lots of photos on mine. I do think it's better if you can have a mix of children on your site rather than just your own if possible but if they don't agree, just put your own on if you can. Ofsted were absolutely fine about mine being on my website when I mentioned it once.