Cristiana Couceiro's illustration style is one of my favorite things I've come across all year. Absolutely beautiful. A perfect balance of lines, shapes, and diagrams, interesting grid use, and the icing on the cake, vintage photography. The design is very clean, but there's definitely a sense of playfulness. I'm sure her work will speak for itself.
Cristiana works form Lisboa, Portugal. To see more of her inspiring work, visit her blog, Sete Dias.