In the image of M 20, a blend of some Ha makes some nice detais stands out, like the dust grains inside the reflection nebula breaking it in three parts (Trifid).
Also is possible to see some dark nebula structrures on the top right side of the image. Some mice features on the south of the emittion nebula can also be seen.
The reflection nebulae also has been dig in good amount around the main nebula.
As a curiosity, there are lots of OIII molucules in this region and a capture using a OIII is in order, to complete this image.

This image is a result of the following stack:
L: 10x10min bin 1x1
RGB: 10X10min bin 1x1
Ha: 15x15min bin1x1

Pre and post-processing in PixInsight