Hi there,
That’s a good effort. It’s a nice simple idea with some good acting choices.
If I may make a suggestion it would be to stick with the poses you have (I think they’re fine for a start) and work on your timing and breakdowns. Layering is valid and the above comments make some good points; but this method also introduces a number of complications which you may want to avoid for a simple action like this, especially if you’re learning. All your overlap and cushioning can be addressed simply with good breakdowns.
Also the IK FK distinction is important… (It seems we have a typo above, as IK is the method most often employed if you have fixed extremities.) The key principle to understand is what happens with your inbetweens when using these methods. If you look at the picture below, both armatures have been keyed to the same position at keys 1 and 2, however the inbetweens are vastly different. IK will move in a straight line, whereas FK will produce an arc. In addition, IK also causes the bone higher up the chain to initially move backwards to allow the bone at the end of the chain to follow the direct path prescribed, and the spacing is now radically different from the FK case. The upshot is use whichever you like, but be aware that IK will generally be more work if you wish to create eccentric actions, and can affect several bones at a time. Although in CG animation inbetweens are automated, this just means you have to be doubly sure you know what is going to happen.
Anyway, good work and my best advice is to keep it simple!