color change in the image

[denzjos]

What I tried :
Duplicate the original layer (name it 'org copy')
Duplicate the 'org copy' (name it 'BW')
Use 'Colours / Desturate / Mono Mixer (change value red to 1.80)
Set only layer 'org copy' visible and select the red on the text with the 'Rectangle Select Tool'
Set the layer 'BW' visble and active
Copy the selected and paste it to a new layer : 'Edit / Paste as / New Layer In Place' and name the layer 'BW corr')
Set the layer mode from layer 'BW corr' to 'Multiply' 
Use the opacity to correct the colour equal to the rest of the text colour
Sharpen the layer "BW corr" to optimise the text : 'Filters / Enhance / Sharpen (Unsharp Mask)'
Set selection off : 'Slect / None'
Set layer 'BW'  and layer 'BW corr' visible and make a new layer with 'New from Visible' and name it 'BW fin')
Copy layer 'BW fin' two times and merge the three layers to darken the whole text
Use 'Colours / Levels' to clean the grey pixels out, move the right slider to the left
Duplicate the now corrected layer 'BW fin' 
Invert layer 'BW fin' and name it 'WB'
Copy the colored photo / drawings from the layer 'org copy' to the 'WB' layer
The photo is no problem, select with the 'Rectangle Select Tool'
The other small things you have to select them with different select tools and copy them(bad quality image as Rich mentioned) or you can search an equal pictogram on the internet