The blue sky background is good. The clouds and the shades of blue work well. One major thing that sticks out to me though, is how elongated their bodies look. Their faces, hair, and hands look good, but their torsos and arms look stretched. The character in the middle has arms that look good, but his knees look like they're facing innards instead of forwards. It kind of makes the net look less like it's in the distance and more like they're giants standing in front of it. Also, and forgive me if this sounds too nitpicky, but the grass looks too light and just looks like generic ground. I only say that since you've drawn pretty detailed backgrounds in the past such as the Takashi Hayabusa picture for example and the same goes for the anatomy of the characters as well.