Zizka: yikes. 

Hi Jok, I use Promotion NG and occasionally I use GrafX2. Predominantly for creating Extra Half Bright palettes, because PMNG has no functionality for that. 

Tobikohiro: Oh dear. Well I'm glad you clicked on the queue to have a closer look. Thank you. 

Protofor: This one took about a week, week and half's worth of pixelling during the evenings. So not too long. I use Promotion's Halftone feature to speed up the dithering process. It's a feature that enables you to control the dithering amount with Wacom Pen pressure. It saves a ton of time.