We recently watched a flock of birds fly and dive in unison. A wonderful and beautiful kind of ballet. This image reminds me of that, with this kind of textured quality it has- presumably the Overlay texture you've used?? Also the sense of distance you create is heightened with this sort of mountain/ tree shape in the lower foreground that has a much darker value, and the "sky" with a lighter value up top. The wispy bit to the right, that seem to have upward brushstrokes, remind me of trees. Some of your work is very abstract, but there's a clear image here to me.
I also just noticed how much I enjoy the very muted palette you often use. Just the introduction of a single color to play against the tonal values is engaging!
I had in mind, in this season of change, the great wheeling cycles of nature, birds in migration ... It's easy to imagine our ancestors following their lead to warmth and sunlight ... We no longer have this sense of urgent movement on a large scale, we aren't forced to flee the elements ... We can be content with brief excursions into nature, "It is good to collect things, but it is better to go on walks" (Anatole France, as quoted in my copy of Chatwin's Songlines) ... A walk is a small migration ...
And that is why this autumn landscape is "small" ... It does not want to describe anything larger than eye's momentary sweep ... There is more allusion in it than description, and you are right to point to ambiguity of sky and tree, merely hinted at in the texture created by the digital oil over the natural media inks (Derwent Inktense pencil), lending body ... What little color there is is in the dark ...
It's a tone poem written out by other means ... You've given it a generous reading ...