They are nice man. I love Jet <3 Try adding some light source to your tags.. and some more depth. Otherwise it's good ! Welcome here.
not bad 1.I like it but the guy doesnt really go with the backgorund and the big white text dont help, i see how itlike fits in that part of the sig but doesnt really work with the rest of it. 2. Not bad , did u smudge or what effects did u do...its lil plain and simple but i think that works so good job. The text isnt good at all the colour the placment and the font 3.Not likign this one coz like the render is on one side the other effects oon the other side, maybe change render placement and dont add the reflection thingy.The text isnt good make it smaller and change the font awell. 4.Not bad but the backgorund isnt vey good i think u need to create some depth and maybe blend in ur render a l;il and try woring with normsl sizes its good to do different stuff but me jus like small stuff personal;ly.