Dark tunnel ahead (Patreon)

The picture finished :) 

Yes we're going to need a bigger boat :D 

So this picture is officially the first one I'm doing -partly- with my new tablet. My screen settings had to be changed a bit so I'm not totally sure how it is in term of lighting ( I probably will have to tweak my settings a bit ). So please tell me does it looks about okay, too dark or too clear in your opinion ? :3