Syncing, organizing, and deleting photos from various albums and events can get unwieldy. That's because these management tasks are based where the photo was derived and what you did with it in the program. With iPhoto for iOS, you may be able to immediately hide an image, but you will not be able to directly delete it if you synced it from your iTunes library or altered it in the app.

If you took an image with your device, you have to go to the Camera Roll to delete it. If you derived it by syncing to your computer, you have to remove it via your computer, or uncheck it in iTunes before resyncing with your device.

You can't rearrange images in albums or events either, or change their order of appearance on screen. The iTunes album I synced with, for example, has several images of aquatic turtles scattered throughout, but I cannot group them together via drag and drop in iPhoto for iOS.

And unless you are syncing identical sets of photos from your iPhone and iPad, do not expect your libraries to look the same across your devices. Content is device specific, with the exception of Photo Stream via iCloud.