Although mass effect legendary edition overhauled the entire trilogy (especially the first game) to make it much better graphically, you could still encounter low-quality textures in places. This is because a significant portion of the lighting and shadows in the game have been predrawn and saved as textures, and some of these textures have not been updated for legendary edition.
The mode, called ALOT (A Lot of Textures), was the best graphics mode you could use for the Mass Effect trilogy, and BioWare even used it as a reference for innovations in legendary edition. CreeperLava, the maker of the mode, has now released a Mass Effect Legendary Edition-compatible version of ALOT.
So if you’re playing Legendary Edition, you can set up this mode to improve graphics even more. Below are two examples for before and after mode:
Before
Post
Before
Post
You can download the mode from here.