We've done this a few times but once again I'd love to see two shots of yours of the same or a similar subject with a considerable time span in between to see your improvements. I'll start with these two: 14 July 2011 and 1 July 2012 Same flower separated by many lessons from many of you.
and 1 July 2012 
Same flower separated by many lessons from many of you. 
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the same building (well, a part of it) in June...
And yesterday's (26ish days away from being done)
This is my latest attempt at it. I definitely have improved since my first one. I have sold a bunch of prints and look forward to creating many more.
Here is the now photo taken on May 23rd
6/24/2012:
Different species of dragonfly, but both taken while riding a paddleboat on Crystal Lake, and in fact not more than 15 yards apart.
Not only do I have a bit more zoom now, I have learned to stalk birds and insects.
6 months later
I'm loving these images! I've got to go back through my work to see if I have anything similar.
May 29th, 2012
And the same bush today
25th of June
3rd July 2012
@jannkc Thank you Jann
27 February
30 March
Here is my first bee shot on day 76 in March
...and here is today's version (day 185)..I've definitely gotten braver!
Then I got a bit better:
2012 June
Here's my first flower shot for my first day in 365. I'm tempted to pull my hair everytime I see this photo. :-)
And here's my 418th photo, I think I've improved so much over time, at least on flower shots. :-)
and here's my latest
Now
Now - June 23, 2012
And today's shot:
Gestating baby- 2/12/11:
Newborn baby- 4/3/11
Baby around her first birthday 4/14/12:
Hee.