Not trying to be a nudge.
When starting new material, if your plan is anything other than a formal upright, plant the trunk at an angle right from the beginning. A bolt upright trunk, perfectly perpendicular to the soil line is difficult to put any sense of movement into. Even a few degrees, as little as 15 degrees off perpendicular would add greatly to the sense of movement and greatly aid in later developing a natural image. Key is the nebari needs to develop with the off vertical trunk angle. Each year in a pot at perfect perpendicular makes tilting the trunk later more difficult.
Many, many people make this mistake, including myself. So my intent is not to be hyper critical, it is as much for the "general audience" and to remind myself to survey my young stock and add a tilt where needed.
I like pitch pines, wish they grew this far west. I do have seed somewhere in my refrigerator. I need to start another round of seedlings.