Hi there, if you have deleted photos from a Mac while you have no backup, iBoysoft Data Recovery Software is recommended here. It is outfitted with advanced disk scanning skills and data recovery algorithms, which scans your hard drive bit by bit and sector by sector for the deleted photo traces and completes deleted photo recovery with a high success rate.
You just need to free download iBoysoft Data Recovery Software and start to recover deleted photos on your Mac, then the deleted files will back to your computer.
Moreover, always back up your Mac hard drive with Time Machine, or you might suffer from data loss someday.