I've shipped paper artwork before! Just plain scotch bubble mailers from target- and you can cut cardboard from like, an old cereal box or anything similar to put on both sides for extra stability! Then I write "DO NOT BEND" on both sides of the envelope in red sharpie + large letters. I've never had any issues with products getting damaged! Even when international
also as far as shipping goes, what ive done before and usually see people do is to use the flat "bubble mailer" envelopes (idk if you might have a different name for them there) and then also put the art itself between two pieces of thin cardboard with the envelope labeled on the outside "fragile - do not bend" on both sides of it
its still a bit of a crapshoot especially if its going to someone in the US since the post here is kinda hit or miss sometimes BUT that seems to be the most efficient way of keeping it safe
Traditional art examples yo I don't know about pricing just yet Headshot stuff like this would probably be like... €15 per character? €7 for extra character in the same drawing like shown here. Fullbody stuff would be more like €25 for a single character, probably? Maybe less if it was simple and unshaded. Full images,,, oh boy that depends The cheapest option for these would start at €60 I imagine? But that would be simpler than shown above,,, basically, the more ink I'd have to use and the more detail to be added, the more it costs. For the forest scene I'd probably charge €120 because it took, so, long, The pirate one, more about €90? These probably wouldn't be so cheap.
These prices would probably include shipping! I'd just need to figure out envelopes and how to keep the art safe during shipment (does anyone have tips on shipping traditional art)? So yea, let me know! I know these prices are expensive, it's just that I'd have to buy paper and new pens and also envelopes...