Zimbabwe Benefit Poster

So I made this poster for a Concert being held for Zimbabwe in Rock Hiil. My color scheme is inspired by Zimbabwe's flag colors, yellow, green, and red. The main graphic is an Acacia tree, commonly found in africa, and the sunset behind it is a modified photo that I took awhile back. I still don't view it as complete (as always)so give suggestions please! OH, and show up for the concert, it's going to be fun!