I like the last one the best, Tramp Stamp. With that being said, it's still not perfect; some of the extensions, such as the ones on the T and at the bottom of the R are very out of place and strange looking. Also, I feel like the O is so out of place from the rest of the letters. I assume that's what you were going for, but nonetheless I can't help but feel that it throws of the flow of the entire rest of the sketch...
Some of the work that you post is bad, and some shows potential, such as the last one that I just referenced (the pink one). Try to stick closer to that style and play off of that; work with what you're good at and build off of it. Regardless, keep it up; you'll get better in time.