Go to this web site:
There is a picture of George & Jeremiah, but not one of Andrew; however there is a description of him (age 17, blue eyes, auburn hair, fair complexion, occupation student & was 5’ 7 ½” tall). It is also interesting that he transferred from his father's company to his brothers.
Because my book contains the letters and diaries of the soldiers from Louisiana (including many form the 27th LA Inf.) who where at Vicksburg, I believe that when you read it you will gain a new appreciation for what these men went thought during the war because you will be reading there words describing events as they saw them.
Hope this helps; let me know if I can assist further.