I'm presuming you picked up frosty mod manager somewhere along the way, since some of these mods are frosty mod manager-exclusive mods.
Hairstyle Day Da:i requires you to have the black emporium DLC installed, as do all hair mods made for frosty mod manager, so if you don't have that installed, go grab it, and by that I don't mean the visibility fix mod, I mean the actual DLC addon published by bioware for dragon age. If you didn't have that DLC already installed, I would make sure that after installing it, you go to where your dragon age inquisition is installed (same place you would have pointed the mod manager when setting it up), and delete the ModData folder, it will come back later, but that's alright, you don't have to keep deleting it unless problems arise (it's the frosty merged mods folder.)
Also, whilst hairstyle day DA:I does come with it's own textures, these textures do not alter the look of other hairstyles in a significant way as they mostly comply to dragon age's regular hair texture layout, there may be a few floaty bits on other characters hairs with it installed, but I've not personally experienced any pixilation with it, that may be due to either not having the black emporium dlc if you don't have it, or loading a dai mod manager hair retexture via frosty, if you are using any (I explain what retextures are further down.)
I don't know which file you're using from the specializations mod, but, note, specialization mods are not compatible with the complete or custom hair patch version of enhanced character creation, since they edit the same files. It is, however, compatible with the lite version of enhanced character creation. Also, if you're using the slider files from the modded hair in black emporium page, make sure you're following the instructions in the second to top comment of the mods page if you want to use it with enhanced character creation (though, note that the slider file of the mod will clash with specialization mods.)
If you're loading any of the following mods through frosty mod manager directly, you should not do this as these are dai mod manager retextures (in other words, mods for dai mod manager that change the details and designs painted onto things), and those do not play well when loaded through frosty:
Fresh Skin for fQun
Silver Knight - The Celtic Commander
Qunari Skyhold Outfit Textures
Human Male Skyhold Outfit Textures
Eyebrows 4 men (this also clashes with eyebrows 4 women so you shouldn't use both at once)
New and improved makeup for all
HD Eye Textures
Katherine Face Texture (eyebrows 4 women from that page should be okay though if using frosty version)
Sheps Tattoo Collection
All of those mods should ideally only be loaded via dai mod manager. The rest I think are safe to load via frosty mod manager directly, provided they are exracted first.
Also, DAI Reshade is not something that you load via a mod manager, since it is a reshade, you will need a program called reshade in order to install it.
I'm not sure in what way you are loading these mods, but, do note that if you are using both mod managers at once, the mods you have loaded via frosty are not going to work unless you do a special workaround to use both mod managers together. So if you're using both mod managers at once, your frosty mods won't load unless you do this workaround.
Edited by Dmitrias, 30 January 2022 - 10:15 PM.