This is a Bokuto X Kirishima from Boku No Hero Academia, I don't know why but I pictured like a rebellious theme, it's your story however. There's plenty of space for a title and credit to author.
Don't really know why this would be a book cover but it's pretty so whatever you want. But it's Shiro from Voltron. Also space for title credit to author.
These next few are some older ones I did where I added titles of my own just so you could see what the word art and centering would look like, they're sh*t titles so sorry.
I believe this is Rinharu of Free!Iwatobi Swim Club. Like I said I got no clue what the title is.
This ones pretty simple it's MakoHaru, Free!Iwatobi Swim Club, kinda lovers in winter situation.
This one actually had a pretty neat feel while making it, it's not meant to be shocking or anything it's just okay. But this is Izuku X Bokugo of Boku No Hero Academia.
And I can't resist a little JohnLock, it's not great. However, I like this title and I can fix it up to a nicer looking one.