Thanks for sharing your art with us, both old and new. :) I think they're both adorable! The styles also differ to the extent that I'm not sure if there's a point in comparing and determining which one is objectively better - if you feel your skills have improved, and if you like the new stylistic choices better, that's the most important thing. ^^ Keep up the good work!
In the first pic I'm drawn to the soft colouring and linework, and the dynamic pose. You also captured the G1 head style very well! The second pic engages with the viewer and I think that's what makes it more appealing. Her eyes are very pretty and I like that you've let your personal style shine! The colours are also closer to real Locket, and her body seems more proportionate.