How to upload a picture to this club as a regular size photo?

It just depends on the size of the image. Whatever the size of the image that's where it's going to go. anda just need to check the size of the image. Here's some ex:
gambar 250px oleh 250px atau smaller will go to icons.
Images: 1000px oleh 1000px atau larger will go to wallpaper. gambar 400px oleh 400px atau larger go to foto atau fanart (but that's oleh choice)

Hope that helps :)