Inkwork

This app is actually quite surprising. Many presets to choose from, but it could have some more editing features, like a customizable line-width and -density. Also the background color can only be 1 color, no color gradient or an imported picture.
But if you’re creative enough you can use Inkwork’s results in other photo editing apps, for very unique images.
All in all it’s a big Thumbs Up!

This app converts your photo into a pen and ink drawing, not just into a preset but you can choose between wonderful styles, and edit those even further. I use it for checking my ideas for pen and ink drawings, you can easily see what is wrong or what is better. I love the ease of it, I use primarily Procreate and sketchbook but this app is a very very cool tool. Of course you can make a fantastic photo doodle for a friend in seconds. Great support also. Recommended app and a beautiful tool.