In this image I feel there are a few things worth mentioning.
Breaking down the kick anatomically, the impact of a side kick should always be delivered with the heel. The kick in the image is leading with the ball of the foot and toes, creating a cushion that dampens the impact. This is usually an independent problem that has to be worked out through correct practice and repetition.
See what the right arm is doing? That indicates that you are 'corkscrewing' or not following through with your upper body. In simplest terms, a lot of the energy of the kick was either never created or cancelled out because the upper body was turning or pushing Away from the direction of the kick.
The left hand/arm is in a terrible defensive position leaving the head wide open to a counter.
Remember, this is still a linear kick. That means the twist or rotation is in the vertical axis. The kicking leg (horizontal axis) is moving linear. It looks like there is a lot of arc in the kicking leg.
Very close but your hips are still a little open. Especially relative to where your shoulders are which may be a little over rotated. This could simply be because you are doing an air kick.
The exception here would be if you were intending to follow through with a kick moving forward. However, the upper body does not indicate this.