It's always a good idea when transferring files to use the Copy rather then Move function. If something goes wrong, the original can get deleted but the new file not written (yes, in spite of my advice, it's happened to me :smileyembarrassed:). If you copy, you can check that all's well before deleting the original.
I'm not quite sure what you mean by "my diary" but, assuming the photos are simply in the main storage of your phone, try going into the gallery app and making sure that all albums are selected for display. You could also use the file manager app to explore the SD card. One possible pitfall is that, if you used a 3rd party (ie non-system) app to move the files, the write operation failed because it didn't have the necessary permissions to access the card. In fact, that's exactly what happened to me.
If the photos are important, the only hope will be recovery software. Stop using the phone immediately to lessen the likelihood of the file locations being over-written. Find a suitable program that'll run on a PC (some have a trial-period option). Then connect the phone by cable as external storage and use the recovery program to scan the phone. With luck, you may get something back.
Sorry it's not better news. I'll also remind you of Schofield's Law, which says that data doesn't exist at all unless it exists in at least 3 places. On an Android device, install Google Photos and enable automatic backup (over wifi only to save mobile data). For belt & braces, use Dropbox as well.
