Nice coloring, even nicer drawing. I like the simplicity it portrays, and the contrast between the inside of the circular frame and outside the frame. The flowers (roses) is a nice touch, too.
One thing you could improve on, is to better redefine your lines, and especially the outer lines where drawing meets negative space (the white.) As for the negative space itself, I would recommend you use toned paper in the future. I also would've loved more contrast; more different shades of the same colors. For example, red, crimson and pink. Green, amazon green and army green. What that does is that it brings more life to the drawing.
This piece has such a lovely feeling to it. Colors match each other..the warm pink colored roses contrast with the cold navy parts of the drawing. The mix of color create a perfect harmony. You should work more on making your artworks look less flat. You can do this by adding more shading and highlights,by adding wrinkles and folds to the clothing, by adding more lines to the hair to make it look more real. All in all this is a beautiful piece and even though you still have to work on somethings, this still has a great impact. Looking forward to see more from you.