Several of them are soft or background focused and there is some pixelization on a few of them Questions what are your specs? Camera & lens ISO Exposure mode Shutter Speed Aperture Focus modes & points Editing software Resizing process
The guy in the second picture got some serious air.. I find the last picture to be really soft on focus.
Try to crop them tighter in camera, wait for the action to get closer also exposures are very up and down. What camera and lens were you using ?
Thanks for the comments....using Olympus e-410 with kit lens and shooting with sports mode. Was first attempt with the camera at Soccer games. What do you mean by 'soft on focus'? Thanks again.
Ditch the sports mode, aperture priority biggest aperture and you will always get the highest speed for that aperture adjust ISO to get a speed above 1/400