I like the Lego elements you're using. When you add extra pieces to the exterior of a vehicle, that's called greebling; and you're doing a good job with that. I like how you've added a white background to help the viewer focus on your creation. The next step is lighting; bring a small desk lamp to the photography set-up, to cast more light on the subject (just like out light-box in class). Then, make sure the flash is off on the camera and it's set to marco mode (there's a little flower that should appear on the screen when it's on. You're well on your way to being an expert at this, keep up the good work!