Well, a "Cool Cover" I believe is a bit subjective depending no the person, but I consider the Covers I did pretty cool 
Thank you for the thread 
Giri, a One-Shot at the moment on Webtoon Canvas and Tapas
There is also a Spanish Version in Canvas de Webtoon and Manga Plus Creators
"Cutting problems at the root!" The street of the city are always dangerous at night, but recently something more sinister than purse-snatchers and hoodlums lurks in the darkness waiting for its next prey. Only a select few know the truth and from them just a fraction have the will and the strength to face the perils hidden in the shadows. One of them is... Giri
Genre: Action, Superhero (Tokusatsu)
Story by Kuma
Art by Red Lenai
Scarlet Society, you can read it on Webtoon Canvas or Tapas.Io (Season 2 is just starting!)
There is also a Spanish Version in Canvas de Webtoon and Akaya Media
The Son of a Vampire Dynasty and the Daughter of a Very Old and Infamous Coven, Will these two choose love or revenge? Stay tuned to see the tension between these two as they try to honor their families wishes, sort through a decades-old curse and the secrets that go with it, and of course find out if they can really put everything behind them and follow their hearts desire.
Genre: Romance, Supernatural
Story by Addie French
Art by Red Lenai (First episodes done by JAT-Works)
Love Quotes (BL), you can read it on Webtoon Canvas or Tapas.Io (Finished)
There is also a Spanish Version in Canvas de Webtoon and Akaya Media
Let me introduce you to Sam and Matt as we witness different scenes of their love journey through a heartwarming series of illustrated poems.
Genre: Romance, Slice of Life
Story by OfficialGenesis
Art by Red Lenai
Solomon's Time, you can read it on Webtoon Canvas or Tapas.Io (Finished)
There is also a Spanish Version in Canvas de Webtoon and Akaya Media
The hunter and exorcist, Romaní Almagus, is forced to a task involving a cambion child, the offspring of a human and a demon. What seemed to be a simple study of the Vatican's enemies, became something else.
Genre: Short Story, Heartwarming
Story and Art by Red Lenai
Script by Kuma
I've also done the Cover art for some novels from fellow Tapas members
Centris, you can read it on Tapas
The Kingdom of Via is in the midst of a silent war between factions of noblemen. A young mage from a lowborn family and a knight from a noble clan will end up being unwitting pawns in the conspiracy slowly closing its grip around the whole nation.
Genre: Fantasy, Action
Novel by Kuma
Corrections by Web Flotsam
Hunting the Dark, you can read it on Tapas
Ethan didn't transfer to Folkhelm looking for trouble. Attending a university at the center of a small town rife with rumors and superstition, he's quick to realize there may be fact to the myths surrounding one man that seems to be at the center of it all. But the warnings can't stop the way Ethan's drawn to Lyn.
When people start to go missing, Ethan soon discovers there's not just rumors spreading through the quiet town. There's danger lurking in the shadows.
No secret is sacred, and nobody can be trusted. There is a darkness looming over Folkhelm, and Ethan must find the truth before it swallows everything he knows and loves.
Genre: BL, Fantasy
Novel by Leveret Moreau
Co-writting with BijouParadise
The Dark Prince, you can read it in Tapas
Are you willing to kill for your freedom?
The world was at its end, sliding down a slippery slope of carnage and war. Jaycee, a washed-up assassin that was locked up in prison, escaped with the help of a mercenary group named Inanis. Alec, the group’s handsome yet mysterious leader, offered Jaycee his freedom in exchange for one thing: to kill the commander of the World Below.
What Jaycee didn’t know, was that he would get caught up between two conflicting sides in a plot to revive the Dark Prince of legend. It’s said that the intention of whoever revives him will decide the fate of the world.
It’s a battle to the finish line. Will Jaycee and Alec make it to the end, or will it be too late?
Genre: BL, Fantasy
Novel by histo-shizuka
Daughter of Light and Shadow, you can read it in Tapas
Princess Guelida is haunted. She was born with the family curse—visions of people, places, events that have come before. She’s watched her father and sibling fall into these visions, overwhelmed, until they can no longer tell what’s real and what isn’t. It’s only a matter of time before that happens to her.
Before losing herself, she wants to see her friends, her family, and her people safe. It isn’t going to be easy. Ancient technologies that power their world are dying and no one know how to fix them. Her twin sister is surrendering to a political marriage to end a centuries long war they can no longer afford to fight. Worst of all, the planet itself seems to be rising against them as earthquakes threaten the palace and all who live within.
The answer may lie in secrets buried in the past, and her ghosts may be trying to help. She finds herself in a race with a hidden adversary to find a long-forgotten power that could bring hope, or absolute destruction, and discovers a destiny tied in with her curse that could mean she is the power everyone fears.
Genre: Fantasy, Romance, LGBTQ+
Novel by Barbara J Webb
