this is my latest work of "medical" drawings/paintings in an old style.
As always, the first stage is a fully detailed outline.
Then, I applied a flat brownish color to the trachea, bronchi, and bronchioles.
The same for the leaves. I gave them a green color base to start with.
Afterward, I have looked for a nice composition of colors, contrasts, lighting, for the flowers.
At this stage, I have worked through all the details to achieve a realistic result.
To make the painting looks like a color drawing I have lightened everything and accentuated all the lines.
The final result on an old paper texture...
Here my drawing on a black background.
It is very useful to place the entire drawing on a white background and then place it on a darker or black background to check if the drawing is cleanly finished.
Done in Photoshop.
Hope you liked it!