Wow! 14 years old and being so good at proportions and a slight perspective! And also the shadows are on point! What art materials did you use and is this on regular paper? WELL DONE
A tip I can give you is to print copies of this and use those copies to ink/color in your art. So you can keep the original as it is without risking ruining it and practice on those copies and experiment with colors and art materials to broaden your skills.
Keep creating! You clearly have talent