Paula, what I like a lot about this is how you took the critique and information you received here and try to put to use and came back with a much improved photograph.
The subject is good and gritty.
The second shot is really sweet. You caught great lighting, good contrast and good detail. I like the square crop here and it works very well.
I love the effect of that rear tire looking as if its popping outta the picture. By getting very close you achieved that 3 dimensional effect as well as isolating the bike and including no distractions. You went with the right angle for this one.
This is fine photography, good work.