A lot of good feedback from others already, but I will add my two cents, Steve. It looks like you are experiencing difficulty in putting down your fretting hand and getting a good, clean chord. To you I say, "Welcome to the club!" It is maddening to see so many people out there who seem to have no problem playing chords, and yet knowing that you yourself are struggling with it. I feel your pain! Let me paste in a reply I made to another poster on this forum a few weeks ago. It might help you:
I also am finding it challenging to smoothly change from chord to chord. I was talking about this with a friend of mine just the other day. He teaches and plays guitar professionally. I said, "You know what's hard to do on a guitar? Changing cleanly from chord to chord." He replied, "Yes! Non-guitarists think it must be easy, because they see so many people doing it, but it isn't easy. I believe that it takes about a thousand times for it to get into your muscle memory."
You might try taking a chord change that's giving you trouble, and then get your metronome clicking, and just go back and forth. For example, you might put your metronome at 60 beats per minute and then play:
1
F (2-3-4)
G (2-3-4)
F (2-3-4)
G (2-3-4)
F (2-3-4)
G (2-3-4)
F (2-3-4)
G (2-3-4), etc.
Just strumming each chord on beat 1, and then letting it ring for counts 2, 3, and 4, and then playing the other chord, back and forth. It might be a good idea to use beat 4 to make your move to the next chord. At that tempo, you would be doing, what-- fifteen changes per minute? Do that for ten minutes and you'll have done 150 changes. Do that every day for a week and you'll have hit your 1,000 times. If 60 beats per minute is too fast, go slower; find the tempo at which you can nail it. The goal is not speed, but accuracy. The speed comes after you get the accuracy.
In any given tune you might have three or four chord changes that give you trouble. Well, make little exercises (as above) out of those spots, and within a couple of weeks you'll have that issue solved.
When I have a particularly troublesome chord, where some notes aren't sounding, I'll do what Justin suggests, which is: "strum--- arpeggiate--- strum," arpeggiating meaning to play each string individually, like a very slow strum, to make sure each note is ringing. If there's a note that goes "thub," fix it (Lisa explains very clearly how to do this) and go again.
You sound like you are a dedicated and serious student, Steve. Speaking as a music teacher myself (not guitar, though), I can say that the student who just CANNOT play a musical instrument despite regular, dedicated practice is rare, although they do exist. I don't know your situation, but maybe you are getting a lot of info from your teacher, and the information is coming in a lot faster than your muscle memory can take it in. In my own case, even though I practiced quite a lot in college, I felt the need after my bachelors degree to take a couple of years off to really practice tons. It seems like the brain is much quicker at taking in musical information than the body/muscle memory/eye-hand coordination, etc., is. At least, that's how it was for me.