Is there a way to hide camera on lock screen?

Is there a way to hide camera on lock screen?

No, not without disabling the camera and Face Time completely.

As far as an app do editing similar to iPhoto the Photos app is currently under development to replace iPhoto. Tell Apple which features from iPhoto you'd like to see in the new Photos app via http://www.apple.com/feedback/iphoto_ios.html.

There's a 3rd party app, Pixelmator, that has been released recently for the iPhone which is rather advanced. I've not tried it so can't respond from experience. However, I have tried te Mac version and it's quite good.

Pixelmator can a bot more than Photos, and it offers brushed adjustments, like iPhoto had, but it has its price:

https://itunes.apple.com/us/app/pixelmator/id924695435?mt=8

Just search for Pixelmator and you'll find this:

Opps. Wrong store. This is the App Store and we want the iTunes storm. 😟

Actually, Pixelmator for iOS is only available for the iPad:

Pixelmator requires iOS 8, see this page: https://itunes.apple.com/us/app/pixelmator/id924695435?mt=8