...play with the Exposure Value (EV) setting. Take three pictures in a row. Set the EV to -1, take a photo, set the EV to 0, take another picture, set the EV to +1, take the last picture. In the Film world, this was called bracketing where the photographer (who could not see the result until the print came out) did not know if he got the right exposure or not. By bracketing the shot, he had three chances to the get the exposure correct.
Since this is digital and you CAN check the shot after you shot it, take more shots than you need. I usually end up shooting 100 pictures of my builds during construction and at least 50 more after it is pau. (Pau is Hawaiian for finished and is easier to type than finished despite the fact that I have now typed out this explanation of the use of the word "pau")
Ahui ho kako!