You can display your old images in a table with a database query and have a check box associated with each image - the table is built into a form. The site owner will check the boxes of the images they want to remove and then submit the form; the images to delete are then input into an array. You will then have an array of images to delete; write a loop that goes through the array and runs a database query to remove each item from the database one at a time.
in fact in new insert query doesn't store anything for image field
This must be a programming error and nobody will be able to help you without seeing some code.