I don't know much about photos and such but I'd say that guy (you

) to the right would need a bit a' more light. Love the exspression on you handing over the book by the way.
Oh, and light from the window in the picture? Is that a no-no in "the-big-book-of-photo-rules"?
And the color on the shirt in the middle is a bit faded (I'm being very strict, hope it's okay?)
To conclude, it's still good
That garden party idea sounds good!