Looks nice, but 1 problem; ancient Samnites didn't use that shield.
Livy tries to make a connection between ancient Samnites and the gladiatorial Samnites of his day. Other contemporary sources from the period (ie. Dionysius of Halicarnassus) specifically says they bear a
thureos. Frescos show that Samnites used hoplon, rimless circular shields, and thureos-style shields. However, these are all coastal Samnites, and Livy's description of his Samnite shield
may have been applicable for the men inhabiting the inland... may have. The only evidence of a "Samnite" shield that Livy describes (ie. trapezoidal) was found at Talamon, Etruria, "probably commemorating the Roman victory over the Gauls at Talamone in 225 BC..." (Peter Connolly, 2012), so that
may have well been a Celtic shield... may have.
History aside, your shield art is amazing
I'm not all for the green decor on the shields though; blues, reds, yellows and whites seem to have been the Italian colour-scheme. I actually don't think I've ever seen a contemporary painting of an Italian warrior with green clothing, or decorative art