As I mentioned before, I really like iPiccy and picmonkey for photo editing. However, when it comes to more complex photo editing, iPiccy is my favorite. Here are a couple of before and afters, along with video tutorials on exactly how I editing each photo. I mention a lot of my tips in the videos.
This was a picture I wanted to use in my unique photo wall HERE.
You probably wouldn't imagine my header picture was this bad to begin with.
Here's how I did it.
There's a whole lot you can do to make a hideous picture into a great one. I hope this helps a bit.