#1 - I'm not sure that this one is underexposed. Do you see any clipping in the shadows with your editing application/RAW converter? Different monitors are going to see this image differently. I'd think you could lighten it up a touch without losing anything.
Update: Looking at this again my calibrated monitor (instead of the laptop). #1 is indeed a bit dark, and #2 is a bit light, but not too bad to my eyes.
#3 - I don't see any unsharpness due to motion (i.e. wind in this case). It just seems a bit soft, even where I'd expect to see sharpness at the point of focus. Were you very close to this? Perhaps too close? It certainly seems that the lense was not able to properly focus on this. One of the ugly truths of photography is that sometimes your lense is not sharp. Especially when it's wide open or closed down. Traditionally, the 'sweet' spot is about 3 stops open from your smallest aperture (biggest f/stop#). Or is that 3 stops closed from wide open? I always forget. The point is that the apertures at the extreme ranges are likely as sharp. And the degree of unsharpness may change on your focusing distance. One easy way to check lense sharpness is to tack some newspaper pages on a wall. Put the camera on tripod, and using a remote release shoot the pages wide open, closed down, and in the middle (proper exposure for each, don't change the ISO as this can change the apparent sharpness). Examine closely, especially in the corners. I will occasionally put all my lenses through this test, to have a record, and to check them for extreme issues. It is normal to find some unsharpness in the corners at some apertures.
Don't know how much advice you are looking for.... but I'll offer it anyway. Compositionally, I'm not sure why you are taking these photos. And for me that's a bit of an issue. Before you shoot, ask yourself why you are taking the photo - and then answer that question. There is nothing wrong with taking these types of photos, but I don't think you are getting what you are wanting. Not yet.
For #3, I would have tried closing the aperture down slightly to increase sharpness, but not too much. I like the softness. I would have put the bud off-centre, and let the branch form a leading line. Read up on rule of thirds. And then toss that rule aside on a frequent basis, as needed.
Finally, I for #3 I would have wanted to see a much darker blue sky. For me this image could be about the colour. But that wimpy blue sky doesn't do the reds any favours. Find a really nice dark blue sky, and that bud will just pop.
Waloshin: To answer your question "what would I have done?". For #3 you have my answer above. I wouldn't have taken the other photos. At least not until I had a good answer to "Why am I taking this photo?"
Luck.