Now...
In the first three pix, you have a lead line leaving the frame. Two thoughts, first if the horse did not have the lead attached, it would have made for a better picture. Since this is not possible, it would have been better to have the trainer in the frame as well.
The fly on the boot. Well, the lens you have is not meant for macro photography, so shooting things this small will not be very exciting.
I can't figure out why the pic of your GF is soft. There is no exif data on the image. What was the shutter speed, ISO?
I think the last two show the problems with hand holding and low light. Depending on your settings, you should have bumped up the ISO, allowing for a faster shutter speed.
Read up on the rule of thirds for photography. <- This has nothing to do with the above shots.
Most of all, go out and take a lot of pictures! Your film is cheap
