ZOSIA <3 Cheers my good friend. It's the best present everrrrr!!!!
Photo (way of presentation) could use some improving, but the illustration itself is really well done. If you wanted a tip for any painting/drawing to have a more dynamic atmosphere, try to pick balanced proportion of warm and cold colors - for example, your main figure shirt is red, chair is red (warm) and background is yellow (warm as well), that makes it all fuse a little. I believe even coldly colored chair would make the piece stand out more. This is just a suggestion (:
I don't know the reference, but I believe Sherlock's in there...I love it