Christine,
I am not an expert but I have more violets than I want to count (close to 100), read one book and several articles on AV's. In my opinion, the spot on the leaf is not a concern but most probably a "bruise."
When one of my violets does not look quite right to me, I think about garden pests this time of year. Have you looked under the leaves and down into the plant where the leaves attach to the main stem?
I don't water from the bottom because "violets don't like wet feet." That is an old saying but seems to be true. I water mine with hair coloring bottle (not previously used for hair color) and turn the planter 1/4 turn from the light source to keep the plant growing in a rosette form. I blot any drops of water off the leaves.
The first pretty plant may have suckers (baby plants grown in between the rows of leaves.) The second plant has multiple crowns which means more than one plant in that planter. I learned how to separate the plants on youtube.
I hope this helps. I have always had an AV or two in the house. Mine had multiple plants as well and were planted in an "inappropriate" planter. Last year I went crazy and bought a bunch. Since then I have propagated many. I have changed my watering method several times, stuck to the 4 inch recommended pots, "surgically" taken off suckers and made new babies from them and started plants from a single leaf. I have failed a lot, learned a lot, and had a few successes. Welcome to the kingdom of AV's!
