The biggest problem with your title is that it's not in English. Since your story is in English, people who can read your story might not choose to read it, and even if they do, they are unlikely to understand the impact of your title.
In addition, simply Fae or Fairy ― according to Google Translate ― doesn't seem to reflect your story quite well or have a powerful impact on potential readers.
Tips:
Your title should tell the reader a little about your story. Something about the main character, the love interest, objective, important themes or something that tells readers a little bit about the world. Series often have similar titles, for devoted readers and to have a sense of cohesiveness. Some titles can serve to tell you about multiple of these things at once, if you have a play on words.
Title styles (and examples which are not geared for your particular story):
Title styles include one word, usually something simple and bold sounding (Shame). Possessive, which is a good choice in your story particular (Her Elemental). Possessive is mainly for romances. Phrases (usually with double meanings), plays on phrases, and partial phrases are also common (Hot and Bothered, Break a Skull ― as opposed to break a leg, In My Eyes). Two words, first is an adjective/present participle verb (ones that end in -ing) and the second is a noun (Taming Fire, Bright Wings). Lastly, there is the list format. This list is three things at most, but usually two (Script and Solitude).
For your particular story, here are some themes and information you should keep in mind when choosing a title. Your main character is a fae and has a tie to time. Your love interest is human and a pop idol. Your world seems normal, but contains hidden magic. Themes include love, loss, and letting go.
I've also come up with an idea for your title, if you want to take it (don't feel you have to). I was thinking of something like 'Our Time'. It references your main character's power over time and, at the same time, makes it sound like this is the time allotted to the main character and love interest, which, when readers reach the end, emphasises the temporary nature of their time together.
Cover: 8/10
I like the coloration of your cover, and I agree with your choice to include the love interest, since he'll be the draw to fans. However, I feel like there needs to be an element of the main character and fantasy element as well, and maybe a hint of colour too.
Tips:
The hint of colour should be small and vivid (no browns or dark colours). The element of the character can only be a silhouette, which will keep her as a nice hint to the . I'd suggest a fairy wing, probably on the left side of the picture and with low opacity so that you can still see the love interest's face. If you make the wing coloured, you can kill three birds with one stone (fantasy, character, and colour) and get a really cool effect over his face.
