Dear porntivap,
If you you need some additional info for each image, then you have to create fields for each image.
Image 1
Image 1 info
Image 1 Caption
Image 2
Image 2 info
Image 2 Caption
If information for images not important, you can use repetitive fields, where users can add additional image dynamically.
Please let me know if you are satisfied with my answer and if I can help you with any other questions you might have.
Regards,
Gen.