I have what feels like a “dumb question”... Help a noob out?

Hey guys,This has been bothering me for a long while and I haven’t been able to find an answer or solution.I own a Canon T3i/600D. An oldie but still a goodieSCan someone explain to me why my photos look pretty damn different when taken with the “live view lcd” vs when I take it looking through my viewfinder? And it’s not only what I see when looking at them, it’s the end result photo.I feel like my viewfinder photos always end up brother and when take with the live view displaying lcd they’re darker.I appreciate the help! via /r/photography https://ift.tt/2U5BQ9B