Shutter speed Photos

I have been experimenting with shutter speed, the Light photos were taken with a 15 second delay on the shutter and i think that they turned out quite well, and the movement photos were taken with a 1/250 shutter speed to capture the movement in a freeze frame, I think that these turned out well however I wanted to capture an absolutely still image and these images still have some motion blur I think if I was to do these again I would have to Make the shutter speed even faster.