Being a fan of The Witcher saga, and Ciri's in particular, I created a Team Livery based on Ciri's colors. The livery is basically the Racenet one, with a few modifications (especially to rear and front wings) and the addition of some sponsors and The Witchers' logos.
The livery is created so it can be used together with all ingame sponsors, no one should be covered by anything I add. Is highly recommended to replace the livery_starter_03, only doing so you will be able to use ingame sponsors (which are not available if you replace it for a skin like the anniversary one). I included in the repack also an _m and 2 _s files to replace along with it. I believe the first _s file (which is the blank one) fits better, but also the second could please someone's eyes.
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In order to install it, I recommend the ERP Archiver 7.1, since it makes it really easy to. You need to replace "Ciri_livery_d/_m/_s" both into "fom_car" folder and "myteam_ferrari/_mercede/_renault/_honda" (depending on which engine supplier you chose at the start):
1. Open EGO ERP Archiver
2. Click on File, Open.
3. Go to "Steam\steamapps\common\F1 2020\2020_asset_groups\f1_2020_vehicle_package\teams\fom_car\wep" and choose the fom_car.erp file and click open.
4. Find the "livery_starter_03_d/_m/_s" and replace them with the _d/_m/_s which are in the repack folder.
5. Go to File, Save and replace the current "fom_car.erp" file with the old one.
6. Now you gotta do exactly the same thing but with "myteam_YOURENGINE.erp" file located in the "Steam\steamapps\common\F1 2020\2020_asset_groups\f1_2020_vehicle_package\teams\myteam_YOURENGINE\wep". Remember to save the current .erp file as well.
7. I also included an emblem resembling Ciri's swallow logo, if you want to use it, you gotta open (always in the EGO ERP Archiver) the emblem_anniversary.erp file located in "Steam\steamapps\common\F1 2020\2020_asset_groups\ui_package\texture_arrays\customisation\cstm_badge_large\emblem" and replace the emblem_anniversary.tif with "Ciri_emblem" found in the repack folder. Again, save and replace the current .erp file with the old one.
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Mind that these operations will replace the Sunburst livery and the 70yanniversary F1 logo. You can always go back by deleting these .erp files you created and by doing a file integrity check in F12020 Steam library.
This version only includes the Honda logo, but if you really want one for either Mercedes/Renault or Ferrari, just pm me and I will make one with respective logos.
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I wrote down the colors' combinations for ingame sponsors to match livery's colors.
Turquoise is 125/173/128 for sponsors, and 118/236/117 for suit and gloves.
Very light Sky Blue is 149/226/215 for the livery and 149/226/220 for suit and gloves.
Claret (or Bordeaux) is 226/90/16 for the livery and 211/67/34 for suid and gloves.
At least, I find these works quite good for me but feel free to experiment.
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Finally, if you like the number's fonts on the car, feel free to contact me. Just tell me which number you need to be done and I can make you one and explain where to replace it in no time.
Have fun and feel free to let me know what you think