your first few pics (1-4) quite blur leh....was expecting something sharper esp with the bright daylight
pic 5 and 6 was good
for 7....maybe a tighter crop on the big kid might be better?
8...tighter on the ruck might be better (seems a bit overexposed though might be my LCD)
9 is nice (good shot on the scrum, maybe you could have taken it just before the scrumhalf put the ball in)
Have you played rugby before? there's quite a few more standard shots that you can take. (or maybe you just never show them here ha...) like the line up, scoring try, tackling to sidelines, the penalty kick, conversion etc which may make the series more vivid? Just my views...
For the most part the shots are quite soft, no idea if it is due to a soft lens or just plain OOF (out of focus). I think both factors may have to be considered. For action events, you will need continuous auto-focus unless you're pretty handy at twirling the focus ring in manual mode. By the time your camera has achieved focus lock, your subject has moved off.
Try a few passes of unsharp mask to see if that helps things.
Colour wise I think it needs to be a little more contrasty. Are these pictures already processed or straight from the camera (plus adding the borders)?