How to evalute Tramp Art?

This one just arrived in the mail today. What do you think of it?

https://imgur.com/a/ISqlIjc

 

I like it! It's older than what we usually see here in southern Oregon, and a more pleasing color.. I mostly see Depression era pieces in ungraceful , honye-hued forms . As for connoisseurship, I couldn't say, but here is some research reading you can tackle:
Books on Tramp Art:

• Helaine Fendelman (1975). Tramp Art, An Itinerant's Folk Art. New York: E. P. Dutton & CO.
• Clifford A Wallach and Michael Cornish (1998). Tramp Art, One Notch at a Time. New York: Wallach-Irons.
• Helaine Fendelman and Jonathan Taylor (1999). Tramp Art A Folk Art Phenomenon. NY: Stewart, Tabori & Chang.
• Clifford A Wallach (2009). Tramp Art Another Notch, Folk Art from the Heart. Atglen, PA: Schiffer Publishing Ltd.
• Clifford A Wallach (2012). A Legacy in Tramp Art. Atglen, Pa: Schiffer Publishing Ltd.

 

I've found out it is from before 1915 since that uniform is pré-1915 (Belgian army - artillery). I've contacted a few American sites specialised in tramp art. One wasn't interested and the second one (author of one of the books above) hasn't replied (yet).