To get the image into Photoshop, I download all the photos from the session in Apple's iPhoto program on my Mac. From here I can easily open the files in Photoshop.
The biggest flaw in the original is the terrible color accuracy, caused by a conflict between my illumination in daylight and the office in fluorescent light. Even iPhones get confused from time to time. The process of correcting the color balance can be lengthy and difficult - I quickly made a decision to make this a B&W shot. So I created a second layer in PS and made the top layer a monochrome version. I usually like a little tone in my B&W photos, so I set the top layer with a little transparency - maybe 10%... just enough to allow a little color from the underneath layer to come through and tint the image. I also erased a little more of the B&W layer in my eyeball, but you'd never know that unless I told you! Then the layers are merged to lock in the change.
So that quickly gets rid of the color nastiness issue.
The tiny lens of the iPhone has a huge depth of field... which means that everything in your image is likely in sharp focus. A good camera lens is prized both for its sharpness and for its ability to create good looking areas of soft focus when used wide open. To simulate this with the iPhone, I made another duplicate layer. Working with the bottom of the two layers, I applied a Gaussian Blur filter to defocus the image. Going back to the top (sharp) layer and using the eraser tool, I selectively erased the background in the top layer, allowing the soft focus layer to show through. My eraser tool had a little transparency, so that I could defocus the furthest areas of the image more than the closest - just as camera focus would appear. The end result puts a little more "focus" on the hat and hat wearer and a little less focus on the clutter of my desktop. Again, I merged the layers to lock in the changes.