Some macros and a bee

[Overread]

Well went out in the woods today - bad idea they were crawling with walkers! But it did manage to get some decent macro shots of the bluebells and bees.
Shot with Canon EOS 400D and sigma 70-300mm f4-5.6 DG macro
1

at: f8, ISO 800, 1/250
link to larger: http://farm4.static.flickr.com/3268/3261359210_e223917acd_o.jpg

2

at: f11, ISO 800, 1/100
link to larger: http://farm4.static.flickr.com/3425/3260532491_e9ebde4abd_o.jpg

3

at: f8, ISO 800, 1/800
link to larger: http://farm4.static.flickr.com/3474/3260533115_d3e5f3c971_o.jpg

4

at: f8, ISO 800, 1/640
link to larger: http://farm4.static.flickr.com/3475/3260533875_03dde7f467_o.jpg

Now aside from the high ISO (high because of a little wind, tracking a bee and because my tripod has no tilt tightening (broke!)) are there any areas that I can impove in?
Here are some 100% crops of a few of the shots so you can see the quality at full size:
shot 1

shot 3

thanks

 

[ClarkKent]

Number 1...nicely done!

 

[Overread]

Thanks for the compliments!

 

[BoblyBill]

That's nice sharp lens. The bokeh is beautiful. I love how you composed the first one the best. Great job. Wind is a pain to work with.

 

[Bifurcator]

I like 1 and 2 the best!

Both are worthy of wall hangings IMO. Tho, for a wall, the softer focus in #1 might be better.

 

[ernie]

nice background colors in the first two. gives it a soothing peaceful effect ...

 

[notoriouslightning]

I really like the second shot, very nice picture.