How do I add detail to polygons

Support Modeling
1

I have modeled a tripod head from war of the worlds but the detail is no close to the reference I am looking at. The bump on the for head area is supposed to have more detail on it. Should I sculpt it or model it into the polygons with extrude. Here is my reference:

https://www.google.com/search?q=war+of+the+worlds+tripod&biw=1440&bih=799&source=lnms&tbm=isch&sa=X&sqi=2&ved=0ahUKEwjzpqrd-P7NAhXLOz4KHfGJCdEQ_AUIBigB#imgrc=Jm-cZgOLN5OPEM%3A

Here is my model: https://www.youtube.com/watch?v=iTk519CSyVQ

Also the middle light is lacking detail too if you compare my model to it. How should I go about adding detail.