Peacock bass babies can look pretty similar when young. Honestly my best advice is to just spend a lot of time looking at all the different species and noting the slight differences in shape, marking, fins, etc. It's more of just something you pick up over time but explaining it doesnt always come across super clear. You can always post it on here and some of us can help you.
Heres my best attempt at explaining how small temensis look. Temensis have the most slender body height to length ratio, so theyll be longer and leaner than other bass. Theyll have a light tan base color with one solid black line running horizontal from the eye down all the way through the tail fin. Along the line, especially when stressed, you can see 3 vertical black lines pretty evenly spaced along the horizontal line making something of a "plus sign". As they mature the horizontal line will disappear and the vertical bars will deepen in color. Their base body color will turn brownish on top and silver on the bottom, with lots of gold spangling in a rough pattern of horizontal lines all over their body. The horizontal bars never connect to their back like azuls do. Hopefully that helps you going forward
