Plug your phone into your computer and navagate to the phones SD Card using your computers file explorer and you should find the pictures under the DCIM / Camera folder or similar. Keep an eye on the phone as it may ask for permission when you plug the cable into the computer.
According to intructions on that device the phone can hold an sdcard up to 32GB and this would most likely show up when browsing through your computer. I had an older device like yours that would not show internal images stored on the phone unless I transfered the images to the sdcard.
You may be able to transfer images via the Bluetooth program however I suspect the software running that device is limited compared to most smart phones.