Triplet quarter notes are awesome. (STRAW-BER-RY! XDDDD)
This is quite an extravagant piece of artwork. The use of the musical notes give you the immediate impression of what theme you are trying to express. Also with the inclusion of the headphones and look of the girls face makes the observer really understand and even feel what is going on in the picture. The choice of blue coloring literally gives it a 'cool' feel as if she is in a state of calm suspension just lost from all other thoughts of the world and only focused on the music in her headphones. I think overall you did quite a good job and I'd suggest just reducing the number of white line swirls because they feel cluttered with all the other little symbols you've added. Other than that really nice piece!
I guess this is where the phrase 'kawaii' would be most appropriate. A very colorful piece with a vibrant feel. Love the orange star background that doesn't take away from the main focus of the picture. The outfit itself is a very good set especially with the red swoodie over the blue tank top. The shorts aren't anything special but they go well with the upper body. The colors for the person makes it feel really realistic and even if it is 2D, it does have a good humanistic feel. The only critiques I can give is the place were you drew the elbows look like boils with the reddish and white spot. I don't know seems kind of like a detracting hindrance. Also, even though I know its just a simple 2D pic, you could emphasize the cleavage area and make it so the figure doesn't look completely flat (and not only chest area, but hey I'm guy so I notice these things first >.>). Once again a nice colorful piece overall and you did quite a job. Nice work Saku!