Let's see, 1000 text characters -- that's 1KB, or (if 16-bit Unicode) 2KB.
A smallish image embedded as cover art would be between 20KB and 50KB -- a medium largeish one (say, 500x500 pixels?) could easily be closer to 100KB.
If 20KB embedded art doesn't cause a problem, I'd be very surprised if the 2KB text tag caused one.