#1 is quite sharp. I also like that you have an extremely limited color pallette. This makes the photo very effective.
There are two things I see that you can do to watch for in the future. First, watch your vertical and horizontal lines... if they are supposed to be vertical and/or horizontal, it's best to keep them that way in the frame as much as possible. There is quite a tilt here. If there were no lines in the background, it may not even have been noticeable.
Secondly, the door handle in the back left... because it's a strong contrast against the darker area of the background and it's an unusual shape compare to the rest of the background, it stands out and is a distraction. I'm not a fan of the darker area to the left generally, but if the door handle wasn't there, it wouldn't be so bad. Bottom line is, pay close attention to your background.
#2 I'm not experienced with film but I believe this low contrast is a result of overexposure. Overexposure looks a bit different on a digital body. It's not 'wrong' persay... but in general, you want to have a good range of dark tones to light tones for the image to be stimulating to the eye. Can you make great low contrast images? Absolutely 100%. But it's usually not by accident. And for this one, I'd rather see the high detail of the shadows. On the positive, I do like how you seemed to have bounced the light off the ceiling which creates great highlights on the wood finish.
#3 The exposure looks quite good except for the tree is a little 'hot'. It's quite sharp as well. But as you already know, the environment surrounding the.... I'm guessing snow leopard.... is not photogenic. The fence, the branches going everywhere, etc.... I realize you have no control over where the animal is, but try to get in as tight as possible and try to juxtapose the subject against a background that is a little distracting as possible. This may have been the best you could do, that's something you'll have to evaluate on your own.
Overall, not bad at all.