Hii

As per the recent update on the official site of NEET, NTA has announced that if you have uploaded a photograph which does not has white background or your name and date is not written, then there is no issue application will not be rejected.
And for signature, it must not be block letters or initials rest is fine.
So you need not to worry.
Hope this helps
Feel free to revert back for any more help.

Thanks!!