Here's a fun video we made, which depicts how you sometimes end up looking when you've made the wrong choice of fake tanner. Always for best results with a spray tan, choose a salon who acts professionally and has a choice of tanning solutions to choose from. The one-size fits all tanning liquid is not the right choice for most skin tones.
Ask your professional therapist what she recommends for your particular skin type. If she only has the one option then check out some of the other local salons or therapists to see if they can better meet your needs.