I'm going out on a limb here and showing you some experiments. I did two of this same Portland neighborhood scene in order to try out some things. On both I tried blocking in the whole thing first and then refining, which I don't usually do. BUT, I'm finding that works really well with landscapes, and specifically, foliage. I also used my new round brush on a lot of it. I'm not jumping up and down with joy about either, but my husband liked them, so I thought I'd put them out there.
I'd love to start a conversation about blocking in vs. not and process in general. As I try new things I have mixed results, and I'd love to hear what works for you, IF you feel like sharing. Thanks.