Macro is rather hard so it's a decent start.
There's several things to note in these shots.
One is the lighting, which several people have pointed out now so I won't go into that a lot besides saying a flash is handy, even in daylight situations I use flash a lot. Reflectors work too in good bright daylight situations.
The second thing to note is your focus. Both shots don't have the eye(s) in focus, which is a really important thing. Insects are like any other live subject, whether it be birds, goats or humans. Usually you want the eyes in focus (unless there's a very distinct reason not to focus on the eyes, but that usually isn't the case). Focus is hard with macro as the depth of field is small. You're working at f/8 which is workable however higher isn't bad with macro lenses. These lenses are designed to work with smaller apertures so don't worry about going to f/11-f/16, it makes focus easier which is a good thing when you start out with macro.
The last thing is your composition. This is tricky with insects. They're small and just go about their business, so sometimes it just doesn't work out the way you want it.
However, it is good to know that it is usually more interesting to get the insect form the side or front. In both shots you're looking at the insect from above and it is facing away from you, basically you're looking at its backside. Try to get it eye-level, as if you're standing right next to it, and have the bug looking into the camera or to one of the sides (or anything in between the two of course).
Sometimes this simply takes a lot of times. I've had an occasion where I chased a bug for 2 hours just to get one good shot (which turned out to be one of my most awesome shots so far) and I'm sure some people have had worse. Patience is the key, and a bit of luck and trickery helps.
In this case you could try and wait for the bee to crawl back out of the flower so it is coming towards you.
I never use a tripod with insect macro shots by the way, I find it much easier to be able to move around fast.
Don't worry about it too much, you're off to a nice start. Just keep practicing, you'll get the hang of it soon enough.