They look great.
I am not sure I would be stack cutting that thick of wood. A total of 1.5" is quite thick for stacks, IMHO.
You could also try a skip tooth blade. It helps clear the kerf of any sawdust.
This is what I am working on right now. Things are going slow as other things get in the way. Such as gardening, sewing, boat launch, family coming into town etc, etc, etc.
I am a member of the FB group. Don is correct, there are two or three free patterns available.
I really like the first owl you posted. If you could find out where that was posted, we might be able to find the pattern designer.