If possible, request to see pics of the parents. Their offspring will usually be similar in color after they go through their change. Other than that, think about what you like in adults. Do you like high contrasting bands? do you like tipping (dark scales having yellow tips, and visa versa)? Do you like a lot of yellow, or a lot of black? These things can be seen to a certain extent in hatchlings, though it is not 100%. The best advice in getting a killer looking jungle, is buy from a breeder with great looking stock. You will pay more, but it will be worth it in the end.

-Evan