The summoning animation, predictably, is used primarily for summoning creatures and objects. The pose itself looks good as it is, but obviously for both male and female halflings (male halflings more obviously so), the anchor point for the spell effect needs to be fixed so that it is in the intended position and doesn't clip with your characters.
The attack pose is usually used for spells that we throw at other people - guiding bolt, eldritch blast and such. For female halflings, the pose looks quite good; once again, the front foot might be a little bit too stretched out, but not hugely so. The oddity that I'd like to point out here is that the pose itself, being the same one that medium-sized creatures use, makes less on halflings, since it's distinctly downward-angled. That aside, the attachment point for the spell effect is closer to the elbow for female halflings, and it should be fixed to sit above the hand, like for the other models. Once again, male halflings have a foot slip that leaves their back food sinking into the ground - this has a knock-on effect of making the rest of the pose look weaker and more unstable, but fixing the back leg to anchor tot he ground properly will probably fix that. It's worth noting that we have another weapon clipping problem with this pose, though this time it's with waist-mounted weapons, as opposed to back-mounted ones. Waist mounded weapons will end up clipping through the leg on both male and female halflings.
Finally, the 'warding' pose: this one is uncommon, but its used for some compulsion effects - charming, or turning. This one has the same issues as the previous poses: on halflings (male and female) the spell effect is anchored a little bit off from where it's meant to be, and should be brought down a touch so that it's just in front of, or on, the leading hand. Beyond that, the male halflings have their back foot clipping into the ground again, which leads to their stance looking unbalanced and weak. Other than that, however, this one looks good.
The major issues with the casting animations are functionally just a few, that repeat:
- Female halflings are all static and do not animate for any of their casting poses.
- Male halflings often have one or both feet improperly anchored, leaving it to drag down and clip through the ground, weakening the overall appearance of their stance.
- Spell effects need to be checked for anchoring to the correct location on the model, and potentially resized to prevent clipping with the models in the case of summoning.
- Halflings have bad weapon clipping on several of their poses, and both back-mounted weapons and hip-mounted weapons should be checked and adjusted for these poses.
- In some cases, the stretching of the pose risks being too extended, especially on female halflings, however, these are just pushing on the borderline of too stretched, and are just 'extremely dynamic' - as statics the poses look good. As long as they still look good when animated, this isn't a big problem, or a problem at all for some people, I imagine.