Hello, Agnieszka!
Cover Designer: Peter O’Connor of Bespoke covers
Comments about cover design
I sent my cover designer a digital “painting” I did on an iPad, based on a stock photo I bought. He cropped it beautifully, made it more arresting (to me, at least), then added the text (title, etc.). The heroine has a passion for the piano.
This cover is part of a duo, so some continuity was achieved with the choice of fonts and and “painted” images, rather than photos.
You need to make your title and author name more readable. In thumbnail they’ll look like scribbles.