Gautami ;

You've submitted your pass photo and postcard size photo with a blue background. And submitted your application in the process. Now if the conducting body of NEET find your photo out of eligibility conduct; they'll send you a message regarding this to your Email address and registered contact number.

If you don't get any such messages then you're most probably good to go. But mostly that's not the case. They'll send you a message to change your photo providing a link. You can change your photo during the correction window. It's all set to begin from 15th of January and will continue till the 31st of January.

Signature with blue pen may not create any problems. But if there is any error you'll be informed through a SMS to your contact number and Email address regarding every error that you've made. So, wait until 15th Jan for correction window to begin.