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The most important thing is being able to deliver what your client expects from you whether you are using a free tool or a paid tool, that is the only thing that matters to them. Once you've been able to deliver on that, you have done your job.
I see nothing wrong with using free tools and charging your clients for the professional design work you're rendering. Free or paid tools, you need to have the skills to do the job because without it, you won't be able to do and deliver the job.