Hi,
Thanks for inviting me to bid.
What we can do is much more than just posting in Tumblr blogs, that is Rank your website and Videos in Google.
I'm sure your main aim will be to get relevant traffic to your site for the services you provide that is providing photos, and videos to tumblr(and maybe other places too?)
If your site is ranked for keywords like :
cover photo tumblr
photos for tumblr
photo tumblr themes
photo for commercial use
and similarly several other related words (each of the above keywords have around 200-7-- searches per month) in google
Let me know if you are interested and we can get this going at $400 first month and then $300 monthly from 2nd month. You should start seeing significant results by the end of 2-3 months(within 30-40 days for videos, if any)
Thanks
Deepak