1) Ignoring client feedback: Failing to incorporate client feedback can lead to dissatisfaction and revisions will hamper your graphic design company’s reputation.

2) Overlooking typography: Neglecting typography can weaken the overall design and message clarity.

3) Using too many fonts: Using multiple fonts can clutter the design and confuse the viewer.

4) Forgetting about white space: Ignoring white space can make the design feel crowded and overwhelming.

5) Ignoring design principles: Not adhering to fundamental design principles can result in visually unappealing compositions.

6) Neglecting proofreading: Failing to proofread can lead to embarrassing errors that undermine professionalism and can hinder your graphic design company’s reputation. 

7) Overcomplicating designs: Overly complex designs can confuse the audience and dilute the intended message.

8) Lack of research: Not conducting thorough research can result in designs that fail to resonate with the target audience.

9) Ignoring scalability: Designing without considering scalability can lead to issues when the design needs to be resized or adapted for different mediums.

10) Disregarding file organization: Poor file organization can lead to confusion and inefficiency, especially when collaborating with others or revisiting projects.