The full name of the post at Just Creative Design is How To Design A Movie Poster - With An Example. It doesn't matter if movie posters are your thing or not. Jacob Cass walks your through his design process from research through final poster. The project is for a school assignment so the back-and-forth that would be present if you were doing this for a client is missing, but it's still a nice peak into how one designers takes a project from an idea to a cool, finished product.

Related:

• The Design Process
• Form and Function
• How to Create a Workable Page Layout