Check your Regional AD board and learn the ad posting rules.  That directly gets TER guys, some of whom are more likely to write reviews.
.
Check the Photo Only board and learn the posting rules.
.
Are you a member of P411?  If not, read their rules, too.  I think that Providers do not just join, they have to be nominated by a current P411 client (is that close?).  
.
You can offer Discounts, Promotions, Specials, etc. to try to entice guys to write a review, but you cannot barter for a GOOD review or any review.  By using the Regional Ad Board, you are targeting TER guys who know what it's about.  
Do not offer a non-expiring discount.  Put a time limit.
"January Special: $X discount for TER members."  
"February Special: $2X discount for TER members with at least 10 reviews."  
and so on until you've reached your goal.

in other words, TER members.

To that end, market yourself on TER by engaging in the discussion boards, especially your local board.   Put up ads on your local discussion board, and even post your photos on the Photo Board.

 
In time, some TER members will feel comfortable with seeing you and will write a review of you, especially if you ask nicely and give them a big hug and kiss when you ask.   (Don't giggle, it works.)

 
It can take a while, but if you are good, you'll get yourself a following and will prosper.

In addition to establishing yourself on TER, also work towards becoming a P-411 member. Both TER and P-411 are used by the clients that you seek. Many potential clients use both services. Also, if a client chooses to share his TER handle in his P-411 profile, a provider can easily determine if the P-411 client is also a TER member (and therefore a potential and probable reviewer). The terms and conditions for becoming a P-411 member are spelled out in their entirety on their website, but basically you need to demonstrate to them that you are an established and legitimate provider and can show either a recent review by an established reviewer or receive a reference from an established P-411 client member. Providers cannot sponsor other providers.  

Check the link below.

I think you are wasting your money on business cards... at least understand most prospects will not risk carrying them for long.   Even if, hopefully, they don't identify you as an escort.  
In general few ladies want direct phone contact initially, even if you use a business phone or number app (equivelent of a hobby phone for he guys).    
Email is usually prefered until some screening is done.