Can u use the apple watch SE to take actual pictures on the watch

No it has no camera on it. However you can control the paired iPhone with the Camera Remote app. That's sometimes quite handy feature since the iPhone can then be positioned at a distance for the right angle and so on. Read here for more:

Use Camera Remote and timer on Apple Watch - Apple Support

if you mean screenshot then read

How to take a screenshot on Apple Watch - Apple Support

it can be used as a remote for the iphones cam though

Use Camera Remote and timer on Apple Watch - Apple Support

not sure how useful while surfing though

No it doesn't.