Have your put anything new on the drive that has saved these photos on your computer?
If you have not done these similar things, you should try a free recovery tool
to get back your photos from this drive. Honestly, I have tried this freeware to recover my data after accidental deletion. It is quite easy and efficient.
Actually, after the deletion, your data is not gone permanently. It is only the space used to save them that has been marked as "available space" for new data. Therefore, as long as you have not write new things to overwrite the original data, you still have chances to regain them with the help of a reliable recovery program. Note for you
1. Stop using this drive immediately to avoid overwriting the original data, which can make your data gone permanently.
2. Save your recovered photos on a different storage device in case of recovery failure.
3. Back up you data in the future in case of similar problem.