Name:tr_showcase

Clean: Yes, good

Lighting: Ambient a touch too grey, drop the blue value down a bit.
light_de_candle_10 makes that corner seem oddly bright, reduce the radius or remove.

Northmarker: Present, good

Fits exterior: Yes, good

Pathgrid: Perfect, good

Illegal to Sleep Here:

Gridsnap:Yes, good

Bleeders:

misc_de_goblet_01 bleeds into paper.

misc_com_broom_01 bleeds into the wall.

misc_com_bottle_15 bleeds into the floor.

misc_com_bottle_10 bleeds very slightly into the bottle it's resting on and the shelf, a
single unit up on the z coord should fix that.

furn_de_p_bookshelf_01 bleeds into the floor.

de_p_closet_02_de_mclot bleeds into the wall.

bk_vampiresofvvardenfell1 bleeds into the stool.

Floaters:

furn_de_p_bench_03

apparatus_a_mortar_01

Other:

Make sure to delete the ext shell before uploading.

misc_de_drum_02 has an untextured bottom which must not be visible. Cannot be placed on its side.

replace the in_hlaalu_room pieces on the top floor with in_hlaalu_hall pieces and remove the in_hlaalu_room_post. hlaalu_hall and _floor are two subtly different sets so mix and matching on the same floor makes the pillars look messy. Also remove furn_de_tapestry_11, it won't fit there once you've replaced the hall piece.

Furniture that is partially on a rug, such as de_p_closet_02_de_mclot and de_p_chest_02_mclothes3, should be rotated so all 4 legs are on the ground. For this example it would probably be easier to just swap the rug out for a smaller one though.

Tapestry placement needs adjusting, PMd with proper placement example.

Cloth sacks, such as com_sack_02_gold_100, should be sunk into the surface they are on to give the impression of being soft. Same as you did with the pillow.

All the assets used are vanilla, there needs to be some items from Tamriel_Data present to for the showcase to pass.