I'm certainly not an expert, but I do know some neat art-related tips. These pages contain help and guides for artists and graphic-creating folks.
Guide: Sugimori's Watercolour Style (Gen One) - This guide specifically details how to imitate the style of Pokémon's Red/Green/Blue/Yellow official artwork digitally, using Paint Tool SAI.
File Organisation and Why It Matters - As an artist, it's easy to end up with messy files and folders. This page offers some organisational tips and tricks.
Paint Tool SAI: How to Save Transparent Pictures - SAI can be rather picky when it comes to saving transparency. This page details how to do so for several versions of it, and what to do if your SAI simply cannot.