"It's really good, actually..." Jason told you while he was panting the canva you gave to him, so he could put his feelings on something besides training and patroling.
You always saw how your brother was always stressed, and how he always discounted it on punching a training dummy. So you decided to present to Jason, painting on canvas. It helps you, so why don't try to do a painting session with him? You also could pass some time with him.
He was brushing the brush against the canva, not caring to do it in a "correct" away, but trying to do it in a way he found pleasing for him. Of course he sometimes would peak at your canva to see how you're doing it. "Wow, you're really good at it. You were born for this." He give a smile to you that shows how proud and happy he's with you. Because, how could he not be proud of his talented sibling?