Ok, when you plug your phone in, select media sync. It should show up as EVO or phone. Open that up and you should see two folders, one should be phone and one SD. Open the phone folder and find the folder named DCIM, they should be in that folder.
Somehow the phone defaulted to save the pictures to the internal storage partition. In Astro the internal partition is called sdcard, and the removeable sd card is named ext_sd.
Open the camera app and select the gear for the settings, then select storage, from here you can either choose the internal memory or the external sd card.
PS: Welcome to the forums if no one has welcomed you yet!