Great Depth of Field with the phone and the flowers (even if it doesn't target anything).
The dragon looks a little blurry on the nearest part (nose). It would be better if all the head were focused.
instead, there are the eye, roof and bottom of the tower only which are focused, it seems a little strange.
if you have blur in front+back, then
Diaphragm is too open. (sorry, link in french).
if you don't have enough blur in the background, the diaphragm is too closed.
You should get more experienced with the aperture size, focal length and Depth of field.
Take a lot of (same) pictures with different settings to understand which settings is better and see the result. You'll learn from experience.