Well for a newbie your on the right track, well done for your first attempt.
I agree your pics of the bull are big, but the other piece of art was ok.
Try some of the Auction Templates to give it that professional finish.
But as we all have, you will learn as you go along.
Practice makes perfect.
Great job, stay posative, and ask questions, watch, listen and learn my father always told me LOL!
All the very best and happy sales.