I don't think so. According to [0], the passcode is used to protect filesystem encryption keys, meaning that without the code, you cannot decrypt your files. I don't know if pictures are stored encrypted, but I would assume so.
edit: apparently I might be wrong. [0] also says that for a while only Mail storage, was encrypted and the default changed in iOS 7. So if your iPhone is on iOS <= 6, you might be able to use that to gain access to the device and copy pictures. The tools at [1] might help.
edit: apparently I might be wrong. [0] also says that for a while only Mail storage, was encrypted and the default changed in iOS 7. So if your iPhone is on iOS <= 6, you might be able to use that to gain access to the device and copy pictures. The tools at [1] might help.
[1] https://code.google.com/archive/p/iphone-dataprotection/
[0] https://darthnull.org/ios-encryption/