the lighting looks blown out and the material on the balloon just looks like a simple blinn. you could try adding some noise like a bump map or something. Also the specular highlight doesnt seem to effect the logo.

are you thinking of doing some cloth to make it ripple a bit? do they ripple in the wind? i'm not sure.

also are you rendering in linear? the backplate looks a lot brighter in the second image. Whats with the crazy resolution size btw?