these are very difficult fish to sex.
I have a mature adult female and two male LDA01. which are very similar fish and hard to tell apart, may even be the same species. Mine have been breeding for some time now.
I can tell the males for certain when they are full of hair - they have more hair than yours i think -diff to tell from your pics. and i can only tell the female when she is gravid, but the males can get very chubby too.
try taking pics under the water with a flash because thats the only way to get a clear view of how much body hair their is. (out of the water the hair is flattened against the body.)