About the crowd, it is matter of practice, guys. I don't know how to explain you all this. I watched tutorials by shawminator, and then it was all practice. For example: if the stadium is round, you can start from the middle of the main stand and make the crowd to the middle of the stand next to it. In edit mode you can copy the made part and use the "mirror" function to flip it horizontally or vertically. Then you must go to "normals" fix the normals orientation, because when you mirror an object in flips the normals as well. Go to object - normals - flip normals. Here a picture for reference: For shawminators tutorials search somewhere in the forums. He posted some you tube videos.