It sounds like you want to create a well-rounded description of your mom that incorporates her appearance and her personality traits. Here’s a suggestion that incorporates the words “appearance,” “pessimist,” “optimist,” and “familiar”:
"My mom has a warm and familiar presence, with her soft smile and kind eyes that light up when she talks about her passions. While she often carries a slight air of a pessimist, analyzing situations carefully and preparing for the worst, she also has an undeniable optimistic streak that shines through. She believes in finding silver linings even in challenging times, and her balance of realism and hope makes her an inspiring force in our lives."
Feel free to adjust any part of this description to better fit your mom's unique qualities!