The beauty of working with a flat pack is that you can paint each piece separately without having to get in awkward positions or reach around anything. the pieces just lay flat on your table and isn't really much different than painting on a canvas panel.
Each pine needle is painted separately using a size 0 liner brush
This shelf turned out to be a wood veneer so I dropped the pine cones and branches over the edge so we didn't have to look at the core.
Here's a close up of the effect.
Here's a longer shot of the shelf.
The corners aren't bad either.