iPhone 8 
Processed with Focos 
iPhone 8 
Processed with Focos 
iPhone 8 
Processed with Focos
I really like this Focos app because it really adds dimension and character into the photos. It’s interesting also to play around with the aperture and get different photo textures as well.
You are getting good results with the app. Note that none of your examples are a close up or an extreme close up which is the kind of shot you can get shallow depth of field without the app.