The logic of the app has been changed recently. And it is not planned to add new pictures further. If you do not see new daily/puzzle/hidden pictures, that means you've colored all the daily/puzzle/hidden pictures available in the app. 

Nevertheless you can recolor already completed picture.  To proceed, please, follow the steps below:

1. Open the picture you would like to recolor

2. Tap Restart 🔄

3. Confirm you want to recolor the picture

Now you can color the picture again!

Besides you can upload your own images into the app the following way:

1. Open the app

2. Tap My artworks at the bottom of the screen and find Import  tab

2. Tap +

3. Tap Library and choose a picture from your gallery, or tap Photo to make a new photo

4. Select the level from Easy to Hard by moving the arrow

5. Tap Use

Now you can color your own picture!