I finally managed to somehow do this methodically and separated the layers so I can show everyone the rough process, and Ik the jump from 3 to 4 is kinda huge but really there isn't any other way to show the in-between without a timelapse (which I'm always so scared of since my process is ugly π)
But as you can see here (or if you zoom in) I haven't really used the smudge tool, just good ol' round brush and some airbrushing for base (img 3), maybe this way you can kinda see what's going on before it's all blended
Things I haven't included: bounce light, even more details, color/hue adjustments and highlights (very important, it makes artworks so much more alive), and of course, the other variation
Alright, see y'all when it's done (or I might just finish the extra reward early, we'll see)