Most likely not, but it totally depends on many factors. How much do you think your company will worth, how much equity designer will accept as a payment, how much an alternative source of funding the project will cost you, how available the alternative funding. The biggest factor would be how much you value the equity vs. how much the designer values it. I bet the difference would be in order of magnitude so designer would demand a portion of equity that you would value much higher and funding the project from other sources would make more sense. But that's a guess, get into excel and build a model that would give you much more precise answer.