For a first ever photo, that's quite good. You got the most important thing down, which is "a good, clean focus on the main object in the frame" -- the beardie's head, in this case. That's nice and sharp. Much better than some of the first blurry photos I ever took!
These are some things you'll want to think about and are learned habits over time:
- eliminate distractions in the other parts of the photo. The styrofoam corners and lines in the upper part of the photo take away attention from the beardie.
- often -- but not always -- having the object be half in, half out of the frame is usually less than ideal, as it creates a visual sense of things being incomplete.
- you also need to work on your lighting a bit, as the "white" background looks gray -- that's a hard thing to get down, and takes a lot of practice. I still mess it up a lot myself.
So I took your photo and cropped it a little bit, and used Lightroom to adjust the white balance. (Ideally, I would have liked to have the image a little more "zoomed out" -- a little more white space around the beardie's head, but I couldn't crop out the black lines unless I cut it that close.)
Keep in mind I'm a novice, myself, and I'm sure a pro could clean this picture up a lot better than I did. But just take a look at the two side by side, and it may help you start to get an "eye" for things.