[gimp-book-painting] Update paint-dynamics-howto.md

[Americo Gobbo <amerigo src gnome org>]

commit 5eeeeffadc982010173f5bbd23e552a693e4ce2c
Author: Americo Gobbo <jag rabisco gmail com>
Date:   Wed Dec 8 20:39:28 2021 +0000

    Update paint-dynamics-howto.md

 paint-dynamics-howto.md | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/paint-dynamics-howto.md b/paint-dynamics-howto.md
index 1a3bd36..783bed4 100644
--- a/paint-dynamics-howto.md
+++ b/paint-dynamics-howto.md
@@ -3,6 +3,11 @@ The main scope is describe the guidelines to emulate some paint techniques.
 
 Basically the paint dynamic emulates the technique and the brush emulates the stain quality and 
characteristics of the medium, but this is not always true, what I am saying is: that in certain cases some 
stain marks could be alone and without paint dynamics represents a good mark for a dry medium, but with 
limitations to use effectively to paint. In general, a good paint dynamics dedicated to a paint technique, 
e.g., dry media, it could work with many stain marks also with marks thought or pulled by another medium as 
watercolor, for instance.
 
+## Methodology
+To know where until is possible to push the emulation, via paint dynamics, is necessary a method or approach 
to testing different variables and parameters on paint dynamics. In theory, the paint dynamics could be 
thought to simplify the brush set and at minimum, we can have one unique brush for all techniques with 
different paint dynamics, one for each technique, eg. The method or approach could be exemplified so:
+
+_only we need a new brush or a special when the paint dynamics are not capable of emulating effectively a 
specific pictorial technique._
+
 ## Dry Media
 Dry Media is normally associated with drawing tools, such as *graphite pencils*, *charcoal*, *pastel* and 
*crayon*.
 These drawing tools depending of the material which is build releases onto support surface, in general 
paper, creating a characteristic mark.