Seeing as no one else had uploaded patches for Picturesque, I have decided to upload what I made for my own LO.
Note: For mod-added weathers, you also need to add the weather ID to _weatherlist.ini in your enbseries folder. This will make the ENB use the appropriate .ini file for the specific weather.

Audio Overhaul for Skyrim SE by DylanJamesWasTaken
Conflict resolution as well as making Mod_Rain_Heavy_LP responds to AOS' audio slider and adding Picturesque ImageSpace and Volumetric Lighting to new weather added by AOS (USKP_SkyhavenTempleEntranceOvercastRainRE_COPY).

_weatherlist.ini ini tweak: Add 
00aa6c to [WEATHER001] FileName=W_Rain_L.ini

Audio Overhaul for Skyrim SE, Sounds of Skyrim Complete SE and Seasonal Weathers Framework
Merge changes from the mods. Several files available. Be sure to use the Non-SKSE version from Audio overhaul. Files provided by mechanicalpanda

Skyrim Extended Cut - Saints and Seducers
Changes the two weathers from extended cut it's Clear to Picturesque's SkyrimVeryClear and the fog weather to Picturesque's Gloomy weather. File provided by mechanicalpanda

Immersive College of Winterhold
Changes some weathers added from ICW to Picturesque's Style. Load after Picturesque and ICW. Can also be loaded after UCW if the weathers are still present (unsure). Patch provided by mechanicalpanda

Beyond Skyrim - Bruma SE
Changes all the weathers to picturesque's style. Too many weather IDs to count at this point. But you can find them in xEdit. Weather ID is on the left under weather tab. Remove the first three digits and add them to your weatherlist if needed. Clear, cloud, fog, light rain, heavy rain and heavy snow are changed. Patch provided by mechanicalpanda

Beyond Reach
Changes most weathers except the dagon ones as much as possible to picturesque's style. The green ArnimaClear has been changed to normal Picturesque very clear. Adviced to add that particular weather to apocrypha ini's. There are many IDs to count so check xedit for the weather IDs you need to add. Patch provided by mechanicalpanda

Darkend by jkrojmal
Patch custom weathers added by Darkend to work with Picturesque.

_weatherlist.ini ini tweak: Add
161063, 2946e6, 347ad7 to [WEATHER003] FileName=W_Fog_L.ini
356b55 to [WEATHER007] FileName=W_Snow_H.ini

Falskaar by AlexanderJVelicky
Optional: patch Falskaar regions to have new weathers added by Picturesque (SkyrimFogTU, SkyrimVeryClear, SkyrimOvercastRain2).

_weatherlist.ini ini tweak: none

Vigilant by Vicn
Patch custom weathers added by Vigilant to work with Picturesque based on the patch for Obsidion Weathers. I only added Picturesque's ImageSpace and Volumetric Lighting to Obsidian patch's weather data. Credits to DrMegaloblast and omega2008(Arindel) for Obsidion's patch that I used as a base.

Patch version 2.0 was completely remade based on Picturesque weathers data.

_weatherlist.ini ini tweak: Add
2c603b to [WEATHER002] FileName=W_Rain_H.ini
056a0c, 4c07a0 to [WEATHER003] FileName=W_Fog_L.ini
056a0d, 062484, 067bb2, 0701d2, 4bf5aa to [WEATHER008] FileName=W_Defaulted.ini

Wyrmstooth by Jonx0r
Patch custom weathers added by Wyrmstooth to work with Picturesque.

_weatherlist.ini ini tweak: Add
54f2a0, 82a018 to [WEATHER003] FileName=W_Fog_L.ini
627e73 to  [WEATHER008] FileName=W_Defaulted.ini
9e13ab to [WEATHER004] FileName=W_Fog_H.ini