If anybody is interested, here is a detailed description how my editing was done,
Did the presettings in a first step for basics like contrast, brightness, exposure, etc. in „camera raw“
Opened it in photoshop and croped the picture a bit.
Added and blended a black/white layer.
Blended it with a colored second layer (cyan or similar color) with „soft light“ layer settings to get a monochrome cyan colored picture.
Next step was to add a flattened layer, which I blended with „hard light“ layer settings to increase some contrasts a bit.
Next step was adding a layer with the copy of the originally background picture (how it originally looked after raw editing ) and blended it with „divide“ layer settings. This step made the whole picture look a bit smoother.
Next step was to add and blend a black/cyano gradient layer with „soft light“ layer settings, which had a slight effect to saturation and brightness in different areas.
Next step was to add and blend a layer with a „water paper“ filter. Layer settings to „normal“.
Next step was a adding a bit of a lens flare and adusting it’s saturation seperately.
Last step was to add a flattened layer, which I blended with „color burn“ settings. Added a layer mask and effected just the background (without the birds) via the mask, to make the background look a bit “stronger“.
Opacity was adjusted for each layer seperately.
I wanted to give the picture a smooth, slightly misty look, so I didn’t use strong contrasts.