Great photos by a smartphone! Myself using a A6000 from Sony for flowers and other nature photography.
Which smartphone you're using, there is a little DOF, astounding? If you're interested please visit my blog comparison a semi-professional camera can do.
Here is another interesting comparison by Canon. It's obvious that fully fledged cameras can do better photos but the smartphones also do great if you think of the useability, my A6000 is still huge in comparison to a smartphone.. ok not a big Galaxy but a iPhone 4S for example :)