The phrase "to complete the picture" means to provide additional information or details that help someone understand a situation or story better. Full definition
Based upon this information, you can form a more complete picture of what's at stake, and then make your decisions from there. (binaryoptionsu.com)
Future studies will need to clarify the exact role of these genes in intelligence in order to obtain a more complete picture of how genetic differences lead to differences in intelligence. (sciencedaily.com)
To get complete picture of your child's growth, it is important to know their height and weight [Measuring baby growth]. (theparentszone.com)