Hi Pheeruntorn,
Your painting is very good.
Your photographs of your images could use some work. Your photograph should fill the "box" and not have other stuff in the room, or black areas above/below, and the frame should not show. Also, one of your other images, the other still life, has a reflection on it from the light. Look at some images on some other painters' FAA profiles, and you'll see what I mean about how you can make your images look more professionally presented.
I have had a lot of headaches learning how to get my paintings reproduced. What works best for me is getting my paintings scanned, and then doing a little bit of touch-up work on them in Picasa, which is freeware. You can use Picasa to do a certain amount of fixing color problem, crop off unwanted parts of the image, or straighten crooked images.
