Paul... The Lagoon is often imaged, so don't take this to heart too much...but...(you probably already know I call a spade a shovel
)
Stars don't have dark rings around them
The edges of the nebulosity are not really blue/purple (in fact there is quite a bit of reddening dust there)
The core of the nebula is quite bright and compressing this relationship to the outer edges is not quite right...
That said, focus, guiding & noise all really well handled... a good effort.