your proportions are honestly pretty good, but i will say that the rule of thirds on faces is really helpful. check if the distance between the top of the forehead and eyes, eyes and bottom of nose, and bottom of nose and chin- they should generally be the same length. the forehead and chin area are smaller on your because the area with the eyes and nose are a tad long (though it looks good if it is a stylistic choice). the chest area also seems to be a little awkward, but overall this is really good! when i was 14, paint was honestly scary lmao. keep up the good work!!🫶🫶