First two photos could possibly be females. The last two look more like males. I have been raising this species since 1965 and and breeding them since 1972 and have been fooled by animals close to 11" SCL a couple of times regarding their sexes. The appearances of these four animals' tails and anal scutes could change a fair amount as they approach 11" to 12" in SCL.
Too small, only guessing which is highly in accurate. Best thing would be wait for males to flash you, but you still have a few inches before that will happen.