I just started MM this week and have done some aproaches and am practicing negging among other things. Some of the responses im not sure if they are good. Here's a couple examples

Me(to HB8 as im walking past her at work)your hair looks much better today then yesterday)
HB10 that was walking with me-why would you say something like that.
Me-no answer
HB10-must be some inside joke or something(sorta was)

I used this one at the gym today just for fun. I took it from a thread on here.

on stairclimber Me to HB9-Hey wanna race
HB9- no blah blah
Me-you look to slow anyways(she really was very slow)
HB9-Im just really tired blah blah...(she seemed very defensive like she was taking me seriously)
Me-(smiled) im just messing with you then I asked her opinion on something else and she gave a boring answer.

Do these responses show that I negged to hard or is this the usually responce? I think one mistake I made was that I allowed her time to respond and should have immidiatly changed the subject,not sure im new to this and its still hard for me to neg.

With the girl in the store unless you know her well, doing a "drive by" neg would not be the way to go. Try to stay away from negs as openers. I think a simple hey or funny comment would earn you more points.

The opener with the girl in the gym was fine but if she was tired then the neg after was something she was in no mood to deal with. Funny would have been good here as a good laugh would help increase the energy. Some thing like:
YOU: Want to race?
HER: No blah blah
YOU: Here I'll give you an advantage since you look tired. (Turn around and run backwards.) Hey, make sure I don't run into anyone.

If she laughed I would continue, if not then drop it because maybe she was just to tired to flirt.
Getting someones opinion is I think is just used for opening. You opened her with the whole race thing so try not to double up.
I'm still pretty new so this would not be the best way but I think you would see better results.

I guess my question just anwered itself. The 8 that I negged today asked me if I wanted to go rock climbing with her so I guess it worked since she never asked me out before. She has a boyfriend too so it really must of worked. She said I had too go with here now because I told her she was too slow and could never keep up with me rock climbing and stuff like that in a funny way. Im impressed with this negging stuff. Before even when a girl really liked me they would try to get me to ask them out but this one asked me out.