"looms out" is a correct and usable phrase in written English.
It means to appear or come into view in a large and threatening manner. Example: As I walked down the dark hallway, a figure suddenly loomed out from the shadows, causing me to scream in fear.
As I approach the town, a craggy mountain looms out at me through tall, ghostly eucalyptus trees.
In the middle of the bookcase behind his desk, above his empty chair, just where Kim's head would have rested, a single book looms out, cover first.
There is a real sense of menace as you notice that it's there, and then the giant snout looms out at you as you approach the slot.
It brings down Triple Crown hopes, as Baffert ruefully recalled yesterday, and it looms out there as the goal for the horse that may eventually win the Triple Crown for the first time since 1978.
The National Cathedral looms out the window over his shoulder.
The plantation looms out of dense river fog.
Wind and rain have sculpted rock buttresses into wild shapes that loom out at you.
Some theatres will be screening the movie in 3-D: worth catching, if you want the full headlong nonsense to loom out and smack you in the face.
After all, fashion is temporary, but massive, creepy, impractically placed tattoos of your mother's eye looming out at you above drawings of constipated-looking medieval knights in spiky armour are permanent.
There is a car-sized window cut into the rock, looming out over the abyss below, with a sill of crumbling rock perhaps three feet across.
The funky antique shops and bodegas of Abbot Kinney Boulevard and Rose Avenue have given way to "luxury performance makeup" and vegan offerings, while bungalows and duplexes are being replaced by houses looming out to the lot line.
