Dear Naresh
If you want to make changes in th images uploading,  you can do now also. But for remaining follow these..
JEE Main Correction 2018 Dates

JEE Mains Correction in the application form will be one time opportunity to edit application form. There will be an option for one time correction of personal particulars of candidates. JEE Main application form correction 2018 window will be opened from the fourth week of January to the first week of February 2018.

JEE Main 2018 Correction will be done only if the candidates have paid the fee and completed all the steps of online application form of JEE Main. The candidates will modify all the particulars (including images of the photo, thumb impression, and signature) of his/her application form. The balance fee, if any due to correction in particulars, will have to be paid by the candidates during that period. No change will be allowed to switch from CBT to pen paper exam.

Hello,
Don't worry ..You can make correction of your filled details in jee mains application form in the month of january 2018 when the cbse will give a notification on nee mains website for correction.You can edit all your details except mode of exam and language of exam paper.You can keep an eye on jee mains website for more details.
Good luck.

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