Hi Akrozia,
Some thoughts ...
It kinda depends on the size of the space on the wall where it'll be hanging Generally the bigger canvases are printed, the better they look. Also, it's normal to wrap the image around the sides of the frame - so for a given frame thickness, the less of the image you lose when you print bigger (eg if you print a small canvas, both chins will wrap around the frame which isn't ideal -- with a large print the chins will be close to the edge, but may not go around it) (having just said that, the image above may have been a heavy crop, and you may be able to crop it to give yourself more "wiggle room" (it pays to leave more "wiggle room" with shots that are going to be printed on canvas).
By all means sharpen it some more, but on a canvas print it won't make much difference either way - people will look at the image as a whole from a distance, where they won't appreciate sharpening so much in what is a soft-look shot. Try something like 40% @ 4 pixels on the original shot and you should be close.1. I think that the face of my daughter (the child in the picture) should be more sharp
A little - I've brought it back about 1/2 a stop - I've also revealed more shadow detail to increase the amount of light on the (very contrasty) faces. This is an area where you have more wiggle room than you probably realise - what we're trying to do is show a couple of faces illuminated by a lava lamp; but unfortunately, what the camera sees is incident light from the lava lamp and reflected light from the faces - and there is understandably a big difference between them. It's OK to tweak these; all we need to remember is not to tweak them past a point where it doeesn't look natural anymore - and you'd probably be surprised as to just how far you can push things before that occurs.2. I'm not sure about the lava lamp... is it too bright...?
I would do it 1 of 2 ways - either leave it as it is (folks don't expect natural skin colours in situations like this - same with candle light), or (2) desaturate it completely - it would also look nice as a greyscale image.
I'd be happy to post-process and retouch the original image for you so that it's ready for printing if this helps?
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