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#1 looks like a potential bro, but his idea of what I would want him to do versus what I would actually want him to do may differ greatly. I may trust him with my life, but I probably wouldn't trust him to entertain my family for even 20 minutes.
#2 is the one I would trust most, over all.
#3 I'd trust him to be unpredictable and be a liability in most cases.
#4 It really depends; the horns suggest a demonic heritage, which I'd distrust right away, but the face seems trustworthy. I'd probably trust her to be there for me, but I probably wouldn't trust her to not her mouth just yet.
#5 I'd trust her to be good, but again, loose lips sink ships, the road to hell is paved with good intentions, etc.
#6 I'd trust him to do my accounting, but I'd hate to have to purchase a product from, or god forbid, haggle with this guy.
#7 Loose cannon. That slightly raised eyebrow suggests that she (he?) thinks she (he?) is better than you, which means she/he is likely to try to use you to his/her own ends. That being the case, it'll take something big to make her/him trustworthy in my eyes, and even then I'd still trust her/him to weave schemes involving me. (Unless that is a blush on her face, which would make her slightly more trustworthy than mentioned above)
#8 Close tie with #7, but I'd say he is the most untrustworthy due to his expression and what I know of dwarven culture. He is obviously dubious of me, and his xenophobia is likely to make him want to test and/or take advantage of me (which would likely mean the same thing to him) in various ways. I'd expect him to give me bad deals on goods, to place me in difficult social situations, and be a general ass to me until he can accept me as one of his own. Only then can he be a true bro.