NEVER!
Some may say that embellishing the truth is ok to achieve business objectives. But just adding extra cream to your tacos does not mean that there will be any action to deliver what you are promising.
On the contrary, I prefer to believe that it is acceptable, to be honest and transparent to oneself, identify the elements or points you are missing to have an ideal scenario, and then acquire the knowledge that will get you to the point you envision.
It is ok to paint an ideal scenario for your audience to see the dream through this process. But the key will always have to be ACTION. With no action, we get lies; with Action, we get work, development, and ideas that can come true.