Jeff, what you did is fine. I have done the same thing to the interiors of some mahogany shells. I sealed my shells with multiple coats of Tung Oil followed by sanding (in-between each hand-rubbed coat) using 00-00 steel wool. After six or seven passes with the Oil & steel wool, the finish looked and felt as smooth as glass. Nice hard surface finish.
What it did for the drums is; it made them project 10x's better than before! The shells sounded a bit muddy and they were low-volume. Finishing the interiors made them louder and the drum projected beautifully. Nice clear tone, Nothing muddy about it after the treatment. But be aware that it does alter the way a drum sounds. Softer, sanded, open-grained interiors will absorb certain sound vibrations more than others. What you lose is usually on the high end of the spectrum. With finished, hard-coated interiors, more of those vibrations are -reflected- and projected out of the drum by the hard surface (as opposed to absorbing it,) increasing volume and adding more high end tones. In short, they will project better.
You did fine. The inside of that bass drum looks GREAT. Do em all! It's an MIJ Luan kit... no guilt involved. You'll only be making them better!
Did you re-work the bearing edges on those shells? If not, you might want to consider putting a vintage 30 degree inside cut w/round-over to the outside on them. Those luan shells will sing for you with a rich, warm tone. You should pm my friend, JR Frondelli. John has worked on Luan kits and performed little miracles on them. He's a great guy to ask/consult.
John