Within Teamwork.com, you can upload a custom logo
    for each individual project.
Note: If the
    company associated with the project has a company logo already set, this will be used for the
    project until a dedicated project logo is set.
Go to the Settings area of your project and select the General subsection.

Scroll to the bottom of the general settings to the Project Logo section.

When you click the Upload a
        Logo link, you will see an option
    to browse your local drive for an image. 
- It can be GIF, PNG or JPG file type, with
        an RGB profile (CMYK images are not
        supported).
- The image will be resized to a width of
        200 pixels.

Once you have added a project logo, it will
    be displayed at the top of the project details pane on the left of the project's Dashboard area.

You can update or remove the project logo
    anytime after uploading it by going back to
    the Upload Logo option in your
    settings.
Click Update
        Logo to open the project logo
    modal, then select
    the Remove option.

For more information see: Adding a Project
        Announcement
                