Only works if the pictures were in the Camera Roll. iCloud backups also include the Camera Roll, if it is turned on in the iCloud Storage and Backup options.
If the pictures were are not in a backup (which is an all or nothing restore), then they are gone.
It's far too late for me to be saying this here, but in the future, never, never, never trust important files or pictures to just one device or computer.
Good luck.