Noooooooooooooo :c It's harder to find peoples art on Tumblr because of all the other blogs people follow, your art will be cluttered under a bunch of other stuff and it will be hard to see your awesome work. You can just post your doodles/sketches in Scraps because by default it will be turned off so you won't have to worry about over flowing people. It's your opinion and I understand, you can do what you want but I'm just saying this because I've lost a lot of great artists to Tumblr and even if they post on Tumblr, I never see it.
Well I can try, I did link the exact tag within my own journal, so if you use that in the description you can see my full Pokemon Dex thingy, if that helps a little. You wouldn't have to follow day to day on Tumblr and still see them all.