No expierence, how can I use this on windows to decrypt photos?

[unix-ninja]

Android doesn't "encrypt photos". If you have individual encrypted files it was done by a third-party app. More than likely, that would be some type of AES, and since hashcat doesn't really handle encryption, it is going to be useless to you.

(and before you ask, no one around here is going to have a recommendation on another piece of software to use).