Can your iPhone still be recognized by the computer? If not, none of the 3rd-party software can help you extract photos directly from iPhone without backup. If your device can still be recognized by the computer and you made some backup before, then you have 2 choices, once is to restore your iPhone from a relevant backup, the other is to use a 3rd-party iPhone data recovery tool. Those programs can help you recover photos directly from iPhone or extract photos from your iTunes/iCloud backup selectively without overwriting your current data on iPhone. I have a recommendation for you, you can try this professional iPhone data recovery https://www.imyfone.com/iphone-data-recovery/ to recover photos from a dead iPhone.