For a newer person at this, all of your sigs are very smooth looking, which is good compared to something choppy and hard to look at.
[constructive criticism of course]
I think you may have overused the lines. Remember in the other thread where I said about something about to many things make your sig look cluttered? I like how you used lines instead of nothing, but try not to use so many. Mix in other things like smudging and you should be good to go!
The text in the sonic signature is slightly illegible, because it's almost the same color as the background. (Trust me, people can get cranky about things like this. >.>)
Overall, you are progressing very well. Good Job Mega K.