Smooth shading in vector - The Battle for Wesnoth Wiki
Note: This tutorial was written for Inkscape, but should be applicable for other vector drawing programs with similar functionality.
kitty's elvish portraits - Page 32 - The Battle for Wesnoth Forums
Mainline Campaigns - The Battle for Wesnoth Wiki
Create Art - The Battle for Wesnoth Wiki
Vector Inking - The Battle for Wesnoth Wiki
Mainline Campaigns - The Battle for Wesnoth Wiki
Mainline Campaigns - The Battle for Wesnoth Wiki
Elvish Juggernaut - Wesnoth Units Database
CS 428/528 Games and Virtual Environments
Vector Inking - The Battle for Wesnoth Wiki
Using the Battle for Wesnoth Map Editor for Fantasy Hex Maps