How did you do the sunlight? Did you just use white or is there more to it?

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Ideally and usually there is no white paint in watercoloring. The point is in order to convey a sense of absolute brightness one has to use the paper itself. I'm sure there are super bright white©® paints available today, but what makes watercoloring unique is the very light and bright values one can achieve because of water's unique transparency , which opaque, dense paints can only achieve "artificially".

So how did you do it?

I'm not OP, but typically you use negative painting. Paint around the highlights to preserve them, then you can adjust the hotness of them later.

I was dozing off so i didn't realise he wasn't op,and tysvm for telling me

Not OP but someone who uses watercolors:

If you expand the image, you’ll see that there are areas left unpainted or with less paint than other areas. That gives shading.

yeah basically reverse. paint starting with brightest, leave darkest to last.

It looks like a shot of film (:

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Extraordinary. The representation of light is wonderful. I love this.