Need constructive criticism

[BlackPlastic]

Just started to make my own sigs and would like some constructive criticism on how i can improve my work.

My work in couple of hours:

 

[AlexJamesWalker]

should of had render on no2 closer... looks plain,simple effects, aim for deep orange on number 2 would suit it alot more!

 

[nocturnal]

Work more on depth and lightning. Atm the sig looks plain and booring. Try reading some more tutorials.

 

[DlolPics]

looks cool to me. Simple, but cool.

Not my type of pictures though

 

[newrotic]

in my opinion, the text that u chose is not cool looking. perhaps change the text to something not ordinary.

 

[ADM_Trader]

First one is nice i think