When I first came out in Los Angeles 8 years ago, I remember visiting Glamour Boutique LA. The store used to be Jim Bridge's Boutique before he retired. The new manager was super friendly and supportive. It is where I bought my first corset and breast forms. Unfortunately when they lost their lease, the manager decided to move on. I was never impressed by Contessa's Closet. It seemed overpriced and full of cheap jewelry and clothing that wasn't any better than Claires or Ross. I don't miss it but LA does need a good TG-focused store.
If all you need is makeup, I recommend the MAC counter. It may be mainstream but it is great value. They will give you a free makeover if you buy $50 of makeup. At the store I visit in west LA, one of the makeup artists does drag in the evenings so he knows all the tricks.
I would also be willing to help you myself, though we would still need to go shopping for makeup to find the right skin tones etc.
I would be curious if anyone try's Gina's or Femme Reflections. My profile pic on the right is from a makeover I had in London (they have some great services there) but that is bit out of the way