Do I need pictures?: Let's be clear on one thing -
You do not need professional pictures to be evaluated by an agency.
Any new face booker or agent should be able to let you know if they want you based on amateur pictures.
Here are some tips to maximize your chances with pictures you organize:

1) Take both head and body shots.

2) Make sure the outline of the head takes up about 2/3rds of the frame of the headshot image.

3) Use different expressions and camera angles.

4) Body shots are full length and emphasize the contours of the body.

5) Do not show flabby sections of the body – this is not good.

6) For submitting keep your DPI at 72 and pixel size approximately 400 high by 300 wide – or at whatever specifications the agency you are applying to wants.

7) Take a lot of images (25 head, 25 body) and then pick the best ones.

8) Women’s makeup should be light and natural looking. Remember the more makeup the more it will detract from you being accepted

9) Have at least 3 different changes of clothes and hair style per session

10) Make sure your subject is well lit, dark images are no good

11) Although sexy is OK, avoid extreme fashions/jewlery and/or playboy poses

12) Tatoos are generally OK. If however you have one on your forehead this will limit your bookings considerably, maybe even entirely!