How good are my designs and how can I improve on them?

[Borat]

So, basically I've been doing designs completely free the past 4 days and this is what I've done so far. I do them for vouches and absolutely love doing it. I really want/need feedback on how to improve. Also, please do let me know what you think of my work.

Thank you, it's highly appreciated.
If you want free designs just PM me and we can work something out. Much appreciated!

Designs:


NOTE: Please make sure to click the link to see the best quality!

 

[XTeam_ValoxX]

I think its pretty decent. Definitely not starter work, but not quite top-tier work. The second and last images are really professionally made (I really like them), the others I am neutral about.

 

[MSWS]

Hmm, I like the second one and the fourth one. Second one because it's very simplistic but is able to send the information easily without too much unnecessary decoration. The fourth one looks a bit like the Sonic Logo, not sure if you were going for that. Also, the arrow on the fourth one seems to be surrounded insome sort of white? I don't think it looks to good, and I'm not entirely sure that it's intentional. Other than that though, the two look pretty good!

The first one seems like a hot rod logo, not really sure what you were going for on that one. Third one reminds me for some reason of wrestling, but I can defininately see people liking it. Second to last one is interesting, I'm not too sure how I feel about it. I think the text, slashes, and the fire all together are a bit too much. Perhaps straighten out the text and add different styles that surround the text? I'm not an artist, but I think it'd look pretty good.

Keep up the good work!