I picked this original image because I really wanted to improve on the concept: two characters having a conversation at a kid's playground. The original's just sort of mindless: characters staring (or glaring) off into the distance, mouths open like they're talking. I wanted to take that idea and improve the story, while still keeping conversation open to interpretation. Now there's actual interaction between the characters, a deliberate mood, and more information in the image. :3
Obviously I also made other changes. Drake's design's changed dramatically, and I replaced Paul with Justin because Paul and Drake don't really talk to one another. Went with an autumn scene to go with the mood (plus I'm excited for fall). My old pic was waaay color-crazy. Oh, and background, I think I'm better at those now. XDD
Kiinda' bothers me that my shading technique hasn't changed much in seven years. >.> I think I know what I'm going to start working on now...
You have definitely improved, although the first picture still stands the test of time very well. I think the second picture conveys more emotion and is more engaging to the viewer. I find myself completely intrigued as to the contents of the letter and i'm fascinated by the expression of the big guy reading it.
In short, it looks fantastic