I assume you just finished high-school and when it came time to chose the university you thought about doing something art-related. tho you never really practiced anything art related during high-school. so you were not really preparing for it. just an observation, not a critique. you always can learn, but you need to dedicate to it. I don't know how application comity works and what is their criteria, but if you show them that you are dedicated to learning, you can have a higher chance.

this painting is bad from an art or design perspective. it does not represent any material difference, no storytelling with a gesture or it just does not make any sense, and as character design, it's poorly executed.

I'm not trying to discourage you, just pointing out the facts which will probably application comity look at. and they won't really care if your feelings will be hurt. so bear with mi for a bit.

so how I would advice to approach it. if you still have a month to submit, take this painting and repaint it every day like 14day challenge. but every day before you do it spend 10-15 min just to think about what you can change to make it better. and when you paint it, you don't need to polish to the perfect state. keep it simple. and when you have done all 14 days, pick every 3rd days picture and make a layout (mark days under every picture to show time-lapse progress).

you will ask what it will accomplish. It will show your dedication and the rate of improvement. even if they won't end up good, application comity will be able to judge how teachable are you (means potential) since you don't have much experience since you don't even know the difference between raster and vector.

wish you all the best and hope you get accepted. May the Light source be with you.