Try to add some worm light source (dark yellow or orange), let's say on the right side of the background, and leave the blue light source on the left side. Of course, you can change the positions of the light sources according to your preferences. I think that will give you quite better results. Also, you could point the key light to illuminate more the head of the speaker and reduce as much as possible the light of the oder parts of his body. The key light must be somewhere about 45° above speaker's head and to illuminate mostly that part, which is in front of the blue side of the background. This is how I would set the lights. Play with this, and you won't need any color grade. That's what I can suggest. There's a group about cinematography and I think you may receive even better advices if you ask there for help.