Good series, as it goes well with the caption. My personal preference for pic 1 would to have a tighter crop, forget about trying to get the tail into the frame. Afterall the tail is already out of focus and it is not possible to get it sharp unless you sacrifice a smaller aperture for less speed (not possible cos at night low light etc). I have taken the liberty to give you an example from your pic. This is how I would compose my pic, I have cropped it and given a bit more space for the subject on the right. (PS - This is how I would interpret this pic, though not necessary the way or right way) - (I needed to clone more space in this example just to show that more space is needed on the right)
As for the second and third pic, try to get down to the same level of the lizard, you will give more impact and present a view from the subject level. Go figure out yourself on how you can improve on the composition. After all self discovery learning is the best way.
Thanks for sharing and I am sure with more practice you will be producing great shots.