Love the use of multiple long lines to show other competitors running faster than Aiko which you already mentioned.
Not too sure about screen tone but composition-wise, I recommend to not only do quick sketches but also try out different camera angles and ideas. For me, I feel it's more effective if you just show on the Aiko's eye rather than the whole face to show his sheer determination (extreme close-up shot).
I understand that you have to rushed to present your gift on time but do consider that quickly sketching and doodling random pose and camera angles can simulate your mind to go further and get unique perspective. hope that helps and your comics look very very good! congrats, man.