Enough about balls, let’s talk about entries:
Stanley_De_Graef: A cup full of life indeed! I liked the positive idea.
icyou520: In the world of Blender, anything is possible! I liked how the flag seems to be trying to “grab” the trophy. I also found funny how you separated “USA” from “World Champions” 
The trophy looks pretty awesome, by the way.
Evilos: Football must be quite fun when there is no gravity! Poor goal keeper must fly off the field all the time
I liked the greeny wall. but the image looks a bit too blurry overall. I think you should’ve added that effect only on the brightest portions.
3dnotguru: That would be a nice mug! “Hey son, wanna see the world cup?” “Yeah!!!” “Here it is!” (sorry for the stupid dad joke)
I liked how the cup seems to be in space, but a bit more going on on the background would be nice too.
purbosky: Nice gift for a football fan! I just hope no one tries to kick it. Btw, at first I thought this was a jug because the handle seems a bit too thick for a finger.
didierv: I liked how it looks like a frisbee from above. There seems to be some artefacts in the material though. Are they caused by denoising or by the texture?
FlyingBanana: Quite some psychedelic colours there. It feels like the ball is staring at the moon, longing for its company, but it is too far away.
fcharr: I liked the bear, it looks so fluffy. But this is more the ground than the sky, no?
alf0: I have no idea what this is, but the contrast is pretty cool. It looks very mysterious and a bit sci-fi-ish.
eyelight: Creepy. Someone took winning the world cup a bit too far! I just think that there is way too much text for one image. Also, the “neck” of the sprinkler looks a bit too thin. But at least I learned something new today!
abdoubouam: Loved the sense of movement and how you captured the climax of the game. Also cool how much effort you put on the background.
RayVelcoro: Oops, someone is going to get angry when they find out, and I think you can’t glue that together. I liked the mess on the front, but it lacks smaller chunks. Also, the stone materials looks really cool.
RC12: Glad to see it is back in one piece now 
Nice clean render, and good lighting too. The grass feels a bit too short for me though, but maybe that’s the way it is.
fdo: Hey, you can’t touch the ball with your hand! Sounds like a good trophy for the player with the most fouls 
Interesting sculpture.
Ansaar13: I liked how you picked an interesting side of the world cup, with many cultures joining in one place. The buildings are also pretty nice. Did you consider putting the boy really close to the camera? I think that would help to tell a story.
OLG: In the mind of a child, the world cup can happen everyday. This reminds me of my childhood, where almost all kids wanted to be football players when they grow up. Cool idea!
Helge: Haha, I liked the face of the cup in the foreground, kinda like “was this supposed to be exciting?”. Nice colours too.
I really liked that water, by the way. How did you get the colour like that? The water seems to be clear in the front, so I would guess you used the sky for it? Or is it a volumetric?
RobertT: This makes me think of Gaia embracing the Earth. I liked how she looks like an elderly woman, but also quite alien at the same time. The wrinkles are pretty cool too.
Photox: Title says it all 
That’s a pretty crazy lighting effect by the way, I liked it.
3dmad: I liked the character and the story, but it stopped at a cliff-hanger! Now I want to see part 2 in order to know if he made it or not! The movement looks a bit like that of a string-puppet, but at least I could “feel” when he hit the floor.