As an exercise for myself I made an advertisement for a webcam I found on Amazon. Looking up color schemes for this sort of product the modern trend is a lot of gray colors, but I wanted a clear line between eye-catcher and information. For the font I chose Arial since this advertisement is focused on office-personnel and Arial is in my opinion a very business like font.

 Modelled the webcam in Blender, textured the model in Substance 3D Painter, rendered with cycles, made the poster mockup in Inkscape and did post processing in GIMP.