Touch this button on the top bar to launch camera. You can take a snap, then insert it in your note (This feature is only for iPhone).
Touch this button to open photo album to select a picture.
You can zoom and trim the photo before you insert in your note.
By tapping a photo in a note while no keyboard is shown, you can view the photo in full screen. The photo can be zoomed up to 5x by pinch in/out. By single tapping the photo in the mode, you can go back to Note Edit page.
In Note Edit page, touch inside of your note to show the keyboard. Move your cursor just after the photo to delete, then touch button.