Requirment for MN1 Form for UK born kids

[Miangee]

Hi dear all members
amber , vinnay , sssws
I just have received my ILR and wish to apply my uk born children registration on mn1 form and submitting following docs with application plz advice if anything more I need to send
Original Child all passport
Original child birth certificates
Original child current brp cards
Child one Picts pasted where refree singed
Photocopy of my ILR brp as I m traveling don't want to send original
Photocopy of my current pasport

I am confused that they just need one picture as normally they ask for two and there was discounted fees for two kids but i could not find the new payment slip as I have to apply for two kids and finally are HO accept just simple photocopy or needs to go for NCS or from solicitors
Kindly just advice me if am wrong
Thanks