Hi and welcome to BYC - thanks for joining us. I'd suggest posting on the gender / breed forum - https://www.backyardchickens.com/f/15/what-breed-or-gender-is-this but the second photo does not show the face of the bird - the comb and wattle development and colouration are the main ways of determining gender at that age.
pic is between 5-6 weeks. old my buff is my big confusion. was bought as a pullet but I've worried roo from feathering slow but the comb hasn't turned red and is very sweet not very aggressive but is in the upperside of the pecking order. 7 weeks now comb is still no red.