Pokémon Smile/Decorating
From StrategyWiki, the video game walkthrough and strategy guide wiki
Once your picture is saved, you'll get to decorate it. Choose one of the frames to overlay on your picture. Tap the Diglett at the bottom of the screen to rotate through them.
Click the fishing pole at the bottom left to bring up all the stickers you've unlocked. Tap the sticker you want to select it, and then tap on your picture to place it. You can move it around by dragging it, or click the flip, rotate, and resize buttons at the bottom.
Frames
There are 11 frames, 4 default frames and one for each of the 7 landscapes.
Stickers
The first page of stickers can be unlocked by catching Pokémon. Each Pokémon you catch will also unlock it's sticker. These will show up on the next pages.