Lovely visuals arkinyildiz. I agree with Juraj with regards to the lens flares, I am noticing in my visuals as well that I am always drawn to blow them a bit out of proportion and have to bring myself in check every time. They are very fun to play with but you have to be careful not to use them in an excessive manner. I think they're becoming an element similar to the the chromatic aberrations (which I've stopped using altogether) in that it's very easy to abuse them.
Concerning what cecofuli said I highly recommend installing SoulburnScripts created by Neil Blevins since there is a lovely little script that randomizes a whole bunch of parameters such as scale, rotation, translation etc.
Great renders nonetheless!