I really like this first undercoat ! I find it interesting (and important!) that you say you don't like the elements indoors, it's even more a good exercise !
I went back to the drawing I hadn't practiced for a very long time and it's a bit hard ... at the beginning ^^
It's funny, but I came back to your post just after I published mine and it must have hit my unconscious or something because I also started to do some "reflections exercise" :-)
Hope to see the rest !