Hey i love the concept you have, very original idea. Not sure about the colour choices in the background, seems a little overpowering for me but at the same time i like it, i think it's just the bright yellow against the bright orange.
I really admire some of the pros that do an amazing job concepting in paint, love their work too. I feel line is faster to concept in at my skill level, or maybe I just find it more enjoyable. Seeing work like [link] makes me want to explore that style some more.