Sorry, but no one can make a valid comment on whether it's blurry. At postage stamp size, the monster looks nice & sharp. At full screen on youtube, there are all sorts of compression artifacts.
The landing looks a little weird, but hey -- it's a cartoon. Maybe it's supposed to look like that.
The movement in the arms doesn't look very fluid, either.
You can check for yourself to see whether the render settings has produced something different from what you're seeing in your monitor.
Try these steps:
- Open the original project (.aep)
- Import your rendered (blurry?) movie into your Ae project
- Double click the movie to reveal it in a Footage window
- Move the current time indicator (playhead) to a specific frame (let's say frame 30)
- Take a Snapshot (Shift+F5)
- Open your original composition (the one you put into the render queue)
- Move to THE SAME frame (let's say frame 30)
- View it against the snapshot (just press F5)
Does it look blurry? Check your Render Settings.
Choppy? It's possible that the choppy playback is coming from their machine / QuickTime player, send them a smaller version (960x540) so they can judge the playback speed on a smaller movie for approval.
To take a snapshot, you can create 4 using SHIFT+F5, SHIFT+F6, SHIFT+F7, SHIFT+F8
To view the snapshot, press the corresponding F-key (F5, F6, F7, F8)