Hard to tell anything from those pics, I didn't see a cpu fan at all though.
Honestly, you don't seem very pc literate and delving any further into your pc could quite easily void your warranty, I recommend you phone Dell to be honest.
I have a question: Why did you buy a 3D modeling computer if you are playing games on it? ...Maybe I'm missing something here. Kinda slow today actually. I was driving back to school and I turned on a red light...I had sworn it was green, but I guess it was red. I might go take a nap...