Here's another visual/concept image. I'm trying to change the style a tiny bit in each image so that there is some progression, but I think I have a clear idea of what I want the style and colours to be. I'm not happy with the textures and stuff as of yet, but it's nearly there I think. Need to work on some visuals next.
Here are the lines for that other concept image I did. I really love the line quality but I don't think it suits my target audience.