Currently your voting consist of two components the weight, as a minnow this is always set to 100% unless you use the Steem API directly or have a weight slider (activated at about 500 SP), and your voting power. The voting power drains by 2% with each 100% weighted upvote and recovers by 20% in 24 hours.
How much your vote is finally worth in actual Steem Dollars depends on the strength (voting power * voting weight), your Vesting shares (aka Steem Power), and the current size of the reward pool.
Basically, your vote vest is determined by voting power * voting weight * vesting shares. The worth of your vote in SBD is determined by the ratio of your vests in comparison to all recent vote vests by other users.
Details are explained, here, for example: https://steemit.com/steem/@yabapmatt/how-to-calculate-the-value-of-a-vote
My proposal is to add another factor, the revoting power that drops your voting strength by half for each consecutive vote for the same author.