More digital images online
To add yet more digital resources for those looking for illustrations on the early modern period, you can check out the New York Public Library’s (NYPL) Digital Gallery, particularly its “Uniforms and Regimental Regalia: The Vinkhuijzen Collection of Military Costume Illustration” collection. To crib the description: “Nearly 20,000 prints, drawings, watercolors, and printed book and magazine illustrations of military costume as well as military medals, regalia, insignia, coats of arms, and regimental flags, from most times and places except the United States.”
As with so many of these collections, some of the EM holdings are contemporary images while others are 19C lithographs. I’m not pledging for their authenticity or verisimilitude (I can barely spell verisimilitude), but take a peek if you wish.