Without Focos 1 
Processed with Focos 1 
Without Focos 2 
Processed with Focos 2 
Without Focos 3 
Processed with Focos 3
After comparing the pictures that I took with the focus on the phone camera and then the ones edited with focos, what really stood out was the way that the app worked to forcefully blur out certain elements within the pictures. I think it works well throughout these three pictures, but I do think it looks the most natural on the first picture with the bottle. For the other two it looks a little too distorted, but I guess that if your main focus is only the flowers as opposed to everything else behind it, it gets the job done.
In your first example, there is just not enough distance between the subject to get the camera alone for create shallow depth of field.
And as I wrote about your first exercise with the cereal boxes, get closer. Distance between the subject and the camera is the biggest factor in controlling depth of field with a camera phone .