Just an ammendment to your 2b.
The folder which you place your album in can be named whatever you want. The cover art retrieved by your miniPlayer is simply album name.jpg , where album name is the name of the album in the audio files' ID3 tag.
Eg. You have an mp3 and the ID3 tag information is as follows:
Artist: Mikuni Shimokawa
Album: Love Contract
Then in order to enable album art on your miniPlayer, simply place the cover art image into the folder where the songs of the album are located and name that image file "Love Contract.jpg" (without the quotation marks). [Which is what you were trying to say I think, judging by your example]
I havent tried 2a, but it seems like a slightly more tedius process when we can just use album name :D
Good guide btw, great for people who are too lazy to use search function.
