Seeking for an easy way retouching old color photos

[sallyanne]

   

Have you tried colour > levels > auto input layers, a little contrast then sharpen. Doesn't really need much. Cant do much with the sky. 

Part of the roof with this pic is blown out or you could try and select the sky with the magic wand and colour to alpha then add a sky gradient
Normally a little contrast will get rid of a small haze and also brighten colours up

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    With this one I went a little different

Gimp's Auto input levels,

GMIC's Local contrast Enhancement (default),

GMIC's Equalize local Histograms (default) similar to levels

and GMIC's Mighty details (default) does your sharpening, I like this one to bring out bricks and other finer details