What would be the best way to save data like this?

#What could we do Save the data as a Table, but not a regular table, a Dictionary. Tables can also save tables inside of them.

#Tables You probably already know how to make Tables and Dictionaries

local table = {"I am a table", false, "you are a string", 231}

local dictionary = {["Tintinnabulation"] = "The ringing sounds in your ears",
["Abecedarian"] = "Beginner",
["LordDragonZord"] = "English grades are bad but would rather learn English than math."}

Here's the difference between tables and dictionaries. Tables have iterators already set for them which is 1-#table (1 through the number of values in the table). The iterators for dictionaries are set by you. Meaning you can have custom iterators. Another thing is if you want to add values to them you do them in different ways:

table.insert(Table, "Foo")

dictionary["And I would walk 500 miles"] = "and I would walk 500 more"
--Note tables' values can also be added the same method
table[1] = "and I would walk 1000 miles, to see your face just passing by"

#Final Product This is what your script should look like, this is like the blue prints. Base your script off this one.

local ds = game:GetService("DataStoreService"):GetDataStore("Drawing")
--[[plyrdata = {["Part1"] = {["BrickColor"] = BrickColor.new(1),
["Size"] = Vector3.new(),
["CFrame"] = CFrame.new()}}
Save player data like so ^^]]
local datatobesaved = {"BrickColor", "Size", "CFrame"} --List of values that you want to be saved

function setplyrdata(objs, id) --Fills up the table with information
	local table = {}
		for _,p in pairs(objs:GetChildren()) do
			table[p.Name] = {}
			for _,prop in pairs(datatobesaved) do
				table[p.Name][prop] = p[prop]
			end
		end
	end
	return table
end

game:GetService("Players").PlayerAdded:connect(function(plyr)
	local plyrdata = ds:GetAsync(plyr.userId)
	local palate = workspace.PlayersBlocks --Change that
	if plyrdata then
		for i,v in pairs(plyrdata) do
			for _,p in pairs(palate:GetChildren()) do
				if p.Name == i then
					for prop,val in pairs(v) do
						p[prop] = val --Changing the part's property listed earlier to it's value.
					end
				end
			end
		end
	else
		ds:SetAsync(plyr.userId, setplyrdata(palate, plyr.userId)) --Save the table
	end
end)

Hope it helps!(Edit the final product to match your script)