you get the idea! good job. i suggest that you retake the photo of the turtle, but this time think about where you should put the light to place a more interesting shadow. the reason i chose the ball was that it had a shadow that suggested that the ball could be placed in the corner of the frame. depending on your photo and the light sources, placing in the corner might not be best.
lastly, if you're just going for pure product shots, putting the subject in the center is more than appropriate. it's probably preferred for auctions and saleable goods.


