“Can you make that bold?”
“Like designers, if you give a programmer a problem with parameters, they’ll apply every bit of genius they have to solve it in the best possible way. If you tell them how to do it, you’ll suffer the wrath of an angry God.” — Derek Powazek
But unlike programming, design is a collaborative process that benefits from constructive feedback.
So do tell your designer what you honestly feel. Raise questions about the interactions, talk about scenarios they may not have thought of, point out inconsistencies they might have compromised on, comment on the feel and the style if it doesn’t feel right. Your feedback can bring in a new perspective and help a lot. What doesn’t help however, is when somebody tries to micro-manage instead of explaining the problem.
So what should you do? Just frame the feedback better, that’s really all. Instead of telling her to “make that bold”, tell her that you don’t think the title has enough emphasis, or that the headings don’t stand out enough and then let her decide what to do about the problem. Also be ready to support all your feedback with arguments and examples.
“There were some problems with the design; don’t worry I fixed them.”
“Nope, can’t be done.”