So, some of these are decent and some needs some improvement, but the work you put into them for me, depends on the job. For example,
"Rose the riveter "We can do it" tee is our shop shirt. We did 24 of them. There is some gain on the black screen that I would have had adjusted if the run was longer. There could be some improvements, but we had some screen issues and these were done at 47lpi to avoid those issues.
The George Washington is cmyk on darks. I think that was 55lpi on 305mesh. I did this art as a show shirt for Color Matrix in Atlanta among others I've done for them. AS a separator, I found I had made an error and left too much black in the seps of the mask staps (in contrast with the rest or overall washed out feel of the art). The average person won't notice that, but I did. It's bee fixed since then for the show shirts.
BEAUTIFUL is a cmyk at 47lpi 230 mesh. For that, it turned out really well, but here is where LPI and mesh make a difference. If I were to do that at 65lpi-75lpi, on a good weave heavy weight tee, on high mesh, you would be what I would call, a 20% increase in image quality. That's enough to call substantial, thus justifiable. It would look less dotty and more controllable.