I sit here and marvel. She's sixteen. She's only sixteen. At 48 I can't even fantasize about matching her skill. Her use of shades and tone mesmerizes your senses. The roses' colours may not be consistent, but then roses never are. They always vary, they fade, they darken. some even totally change colour.
The strings of beads add a mystical effect the trees are subtle and bare providing back ground without pulling your eye from the picture.
Her first attempt at watercolour. I want to believe she's lying. Watercolour is not an easy paint to work with, tones are hard to keep consistent. Yet she does it with the ease of a master. Adding layers to change the shades. She seems to have used just 5 colours to do this. If correct that is an achievement in itself. I wonder what she will do when she's an adult. For this I eagerly await the future.

For a first attempt to color using watercolor, this actually looks really good. I am impressed with the way you painted her hair; it has this glow to it. I can see some technique in this work of yours; I can see gradiation especially in the hair.

However, there is some uneven coloring in that area of her hair close to her rose hair ornament.

The coloring of the roses are a bit uneven (for example, the reddest rose is the one in her hair), and they look a bit like paper roses, due to their dull color.

I like the soft coloring in her dress; it doesn't look boring due to the use of light and medium shades of green, although it would have been better if you used some darker shades too.

I appreciate the fact that you added a good amount of detail in this work of yours.

The background looks good; that is some effective blurring you used here. It's good that you chose to use a blue background, especially because it makes the girl stand out more, and it makes the piece look more beautiful.

I can see some good sense of anatomy in this piece of yours, but her arms look a bit too thin.

Nevertheless, you did really well here!