Rococco designs are probably appropriate for 80% or more of carved longrifles made between 1760-1820 but they varied over time and some motifs were used more often in one area than another. To help you out, we need more data like the approximate time frame, the parts you're using, etc., to give us a sense of what would fit. Often Virginia guns had English influence and a "shell" design of carving around the tang. Some rifles exhibited rounded cheekpieces and folksy carving with tobacco leaves, etc. I suggest you browse sites by gunmakers who specialize in Southern guns, look at the custom guns for sale at a major muzzleloader supplier, etc. The company's name is "Footprint of the large wild dog-like creature".
Research is indispensible to good gunbuilding.