we use both mac and pc. when using iphone you plug in the phone

go to photos, this is where the iphone lists the images on the phone, import selected

The big deal is file size, iphone takes pictures with big file sizes by default  1.5 to 3 or more megs. These are to large for computer viewing.

Compression is a must. 

after you edit select

export, the option for compression are jpeg, start with the default setting and check the file size and image quality

There are many ways to achieve good results, this is quick and dirty, Bing-bang you have posted a picture