Thats my personal opinion and you can share yours below:
1. Senna - the colour scheme and the outfit looks gorgeous and fits her very well
2. Ekko - really well done and ofc legendary tier the colour scheme here fits him very well even i am not a big fan of it.
3. Qiyana - that skin is a 50/50 for me. i think he fits the theme really well, but i dont like her outfit that much and especially her colour scheme looks not tasteful (that hair yikes) and i don't like her vfx's
4. Akali - looks kinda cool, like the colour scheme here but she already has KDA (?!) but yeah i get why they choose her.
5. Yasuo - totally unncessary. looks out of place, is less freaky and colourfull than the others and its Yasuo...
(the last place is really personal: 6. Prestige Qiyana - WHY?! why her and why prestige at all?)
overall i would give the skinline a solid 6 out of 10.
What do you guys think about the skins?