I agree with the two above, the new thread was unnecessary, especially because placing the old and new sketches together would be beneficial for comparison.
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Sketch 1 - I don't think her glasses look realistic. Glasses are usually rounded on the sides, even the boxier ones. I've never seen glasses that were so square either. Make them thinner. Reference various meganeko for more ideas:
http://tvtropes.org/pmwiki/pmwiki.php/Main/Meganekko .:. Her expression and pose seem much more confident than the last sketch. I don't know if that's what you want for the character, but if she's an introverted nerd-type, I don't think these things are helping.
Sketch 2 - The arms are much too short. Generally, your elbows extend around to your hips. The way he's holding his arms is also awkward, an awkward pose. A ribbon tie is usually only used when the collar is completely buttoned up. As it is here, he looks like he's just wearing a ribbon. Generally, a vest is meant to hug the torso more tightly, accentuating the way a man's torso tapers in from his shoulders to his hips in an upside-down triangle shape.
Sketch 3 - His arms are also too short and his pose is also awkward. The arm holding the coffeecup should be at his side with the elbow meeting the hip and the forearm is foreshortened as it angles toward the viewer. The hand will be at least partially hidden by the cup (which will save you having to draw fingers). Grab a coffeecup and stand in front of the mirror. Look at how you naturally hold it. What I said will become more evident when you see it with your own eyes.
Additionally, the folds on their clothes are all in wrong places and makes their clothing look exceptionally ill-fitted and/or not properly made.
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They are improved from the first batch though. I think that the two things you really need to do to improve them exponentially is merely to look at the anatomy of your males and study how clothes drape a figure's body.
If you are 18 or older, you can simply go to deviantart and follow these subsections: Resources and Stock Images > Model > Male > Nude > Formal, Classical. You'll see plenty of examples of what I'm talking about in regards to a male's physical build such as how long the arm should be, where the elbow is in regard to the hips, how the torso tapers from shoulder to hips, and much more.
I know it may seem pointless to study real anatomy when drawing anime, but anime is fundamentally taking the real anatomy and abstracting it into the form you want. To do that, you need to understand how actual anatomy works, or your anime will never look quite right.
As for the clothing, study the natural folds in your own clothing or look at artists and study where they draw those folds. At this point, many of the folds you have drawn look as though they've been placed there because you wanted to show the clothes draping naturally, but didn't take careful consideration to where you placed those folds. Personally, I learned from studying the art of Arina Tanemura:
http://gallery.aethereality.net/list/artist/18/
I hope you find this advice useful
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