Hi Oksana . When I work on my Watercolors, I will usually hang a photo up for a few days - until it comes to me how it wants to look.
I often wake up with an image in mind.
Now, when I get to painting... that can be a whole different story - because it usually does what it wants.
Still, I like to have an idea in mind.
& Yes ! Like you - when I complete a painting - I am exhausted. Glad to have it done. Eager to work on another. But I must shake that image off - before I can start fresh again.
I work on photographs between paintings when I can't start something new yet due to other projects going on. It's a good way to take a break from the other, & yet still focused on Art.