Sample Picture D90 Using SB700 triggered by Built in flash

Here 2 sample picture that i take using D90 and SB700 as slave that trigger by built-in flash/ D90 pop up flash.

Setting:
'--' for built in flash
'M 1/100' for SB 700 ( if i remember correctly :P )

one of these images is produced by blocking pop-up flash using my hand, hope you can see the difference and know which the picture that produce by blocking pop-up flash.