While there is no guaranteed way to get the photos back, you 'may', and I emphasize 'may', be able to get some of them back. It will depend a lot on how they were deleted and if there is any trace of the data on the phone.
There are a few apps/programs out there that "may" be able to help you recover the data.
A few of the programs you could try would be... DiskDigger, MobiSaver, Android-Recovery and Tenorshare. They are all data recovery apps/programs. There are many others out there, so check around and see which you would rather try.
One important note though, most of these programs are not free. They may say they are "free" or have "Free Trials" and "Free Downloads". Yet to actually recover your data, and get your files back...