So, we have to face with rules, with the rules of the tumblr, and rules of the community.
Be social, they will like you.
So, be social, because you will get more attention, more followers, reblogs, you have more chances to earn some money. The best tumblr money makers I think, the real tumblerers, so there is a tip: hang some time on tumblr, and meet the circumstances, the community, and chose a niche. Chose a nich which you like, because you will like the money making, and willl be happy on tumblr.
Don't be agressive, use the ask.
Turn on the ask button, if they have some questions, answer that, because they will like you, you will be more natural, and get more visitors and fans. It's important.
Use relevant ads.
The advert company and the tumblr will like you, and then you will get more money, because the tumblerers will have more interest in relevant ads(things) so everybody will be happy.
Always be active.
Post pictures/posts every day, they will like you, you will get more traffic, and you will look more natural, use the queue, everybody using that. I will make a section where you can find programs to fill the queue with 300 pictures in seconds, with click-through, tags, descriptions too.