AusBonsai

This red pine is a good example of what you should not do with this species - that is - water it too much or feed it too often.
As you can see, it leads to succulent and course growth (1) were you are looking for finer growth (2)
Infrequent water and mild starvation is key with red pine - if you want it to look like a red pine that is. Next repot will be into a clay pot barely big enough to hold the roots and not repotting more often than every 4 years. It will start to look nice when the upper branches develop that beautiful red pine bark. That will take another few years I'm guessing. Treating as above will hopefully speed this process along.
I also believe some Australian natives will benefit from the same kind of treatment once they are well developed.

Mike this is an amazing tree with great bark. I’m surprised that there are not more comments about it.

I’m also keen to test out your theory in relation to Australian natives by trying to feed/water less to promote finer growth.

I like the movement and taper [although the photo gives a straight bit between 1st and 2nd branches]. Bark on the trunk looks good too.