Lovely lighting.... Great minimalism in the colour and a neat arrangement. I'd suggest upsizing the logo, maybe making it all red...? It's been done, but the space in the corner needs more, and something distinct. Maybe grab a brush and write the stuff, nice and thick on your own?
....yeah XD i'm not about to do it either. But it'd give the right kind of distinction & filler for a signature. Anyway. The fish is great... your colouring shapes it out something fantastic.