I have no critical comments at all. Love the close up and the perspective. The sky looks great and it's cool to see the reflections in the jack. How big is it since you are calling it "gigantic"?
Love that sky and also the drama if this fine shot. Awesome perspective and a great start to this side challenge. I am really looking forward to this series of images from you.
Edited to say, the position of the jack is spot on, and very impressive.
I like the composition. Nice sky. The colors on the rock a seem a little dull. The reflection in the jack is a little distracting, not much you can do about it, just have to be careful what it shows in the next 29 days. :)
I love the illusion of a wide angle macro shot this creates by using an oversize jack. The sky is great, and the texture in the rock and the jack is captured perfect. Wish I had a critique for you, but I can't come up with one.