The antonyms for the word "mis-proportions" are correctly balanced, appropriately sized, proportional, symmetrical, harmonious, and well-proportioned. These antonyms denote a sense of balance and order, unlike the word "mis-proportions," which implies an imbalance or unsuitability. The use of antonyms is crucial in writing because it helps to clarify the intended meaning of a word by showing its opposite in meaning. In conclusion, when referring to size, shape, and form, it's important to use words that convey a sense of proper proportion, harmony, and balance to communicate effectively.