There are tones of mods, and none of them is better or easier to use than the other (all are packages so you need to know how to install those, all of them have easy to use instructions). They all have good points, though people tend to use the expressionless fashion poses for pose player in pictures they need expression in, so if you're doing competitions don't fall into that trap hehe.
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Pose player
http://www.modthesims.info/download.php?t=438706
Don't forget you can access EA poses with it too instead of just custom ones, one list I know of is here
https://docs.google.com/spreadsheet/ccc?authkey=CK...E&hl=en&authkey=CK2s-qsH#gid=0
Reliable list of pose packs out there
http://mysims3blog.blogspot.com/search/label/Custom Poses
Twallen's Debugenabler
http://www.the-isz.com/nraas/index.php?/topic/852-...06/page__pid__15730#entry15730
Does handy stuff like allows you to move objects and sims up and down
Twallen's Animator
http://www.the-isz.com/nraas/index.php?/topic/856-...19/page__pid__15758#entry15758
Trait animations, reactions etc
Animation Player and some animation hacks
http://linna.modthesims.info/download.php?t=441682
https://sites.google.com/site/studiostargirls/downloads/the-sims-3-sets
Animations from expansion packs (no expansion needed) unlocks Vampire animations, prom posing, sculpting posing etc