How to make taillights in RC car look better.?

So idk if there is anyone out here that will answer this question for me that in my hobby of interest but I have a rc drift car and been playing with it recently and put head and tail lights on. Now looking at other people’s rc cars when, when they have there tail lights on it looks like a normal tailight but when I turn mine on it’s just a solid red circle and it looks dingy. I was wondering is there something in doing wrong that’s making it happen? I have it installed in the light buckets that were given to me and I literally just cut it out, glued it and shoved the red tail light in but when I turn it on it’s just a red circle. How can I fix this problem to make it look better? 

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