Have you restored your data back now? Are you sure you've saved all your taken photos on the inner memory card?
One can always restore his data back from a memory card or hard drive when he has saved the data. So, if you have not save it well, I am sorry, I think I cannot help you.
But, if you absolutely saved it there, I think you may have chances to get them all back.
1). Connect this memory card to your computer via a card Reader at first.
2). Do not save new files on this card in case of overwriting your original data.
3). Download some data recovery software to get back your data.
In my experiences, there are several drive data recovery freeware that could work much more efficient than some paid ones, such as Recuva, Power Data Recovery and iCare Data Recovery Free, etc.
4). Restore your data carefully by following the instructions.
5). Do not save the restored photos on the same card in case that everything would mess up.
Note: Learn to back up all your needed data all the time in the future.