This is a very beautiful painting @Thống Lê! Thanks for sharing. You did a great job with the different textures. The statue looks like marble and the drapery looks like fabric. I think if you experimented with the lighting and lost edges a bit, you can take this painting to the next level. Right now, all the elements are fully lit and are don't relate very well to each other. They feel too separate. I think this is because they're a bit blown out by the two light sources. Maybe try experimenting with reducing the intensity of the light source on either side.