You want at least 1m in depth to make the entrance useful. You can approach it as an open canopy or closed and part of the house. The 1960s style was a thin concrete or metal canopy with thin steel posts. This creates a very light feel whilst providing the necessary protection from the elements. Obviously technology has moved on now but the same logic can be applied. Make sure you integrate some lighting and possibly some mail storage depending on the layout of the house.

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I like option 1 the best visually, but I'm not sure about how it will look in the corner nearest the window - perhaps it would be better to widen it - up to wall and end of counter and have nooks for herbs/spice jars on the insides. I have found an image that combines 2/3 and the cupboards either side appear to lessen the bulk of the extractor section. My own extractor is more like option 2 to allow more space on the worktop, but mainly limit the light being blocked from the neighbouring window. It is bulky, but have tried limiting this by painting units and walls in one colour.

I would try to avoid a sun tunnel to start with to see if could be tweaked with paint etc. I would be tempted to paint both the red wall and the wall with the hall door one colour to unite it as a cosy space. It's impossible to pluck colours out of our heads, they have to be tested rigorously as light changes everything. Rooms starved of light will look greyer if painted white, and lack of light makes F&B greys look a bit too grey. Something subtle but with some colour may help, could be a dirty browny pink or a soft 'hay' colour. What is the other colour on the pale walls?