There are fonts out there that just don't mesh well with graphics for blogs. I usually like to find one that's fairly thick, doesn't have a lot of squiggles/brush strokes, and is easy to read. What's the point of making a graphic for your site if you can't read it? You want one that immediately attracts a reader or Pinterest user. I like to use bright (but not overwhelming colors) on these. I also like to test it at multiple sizes, to make sure that, no matter what, the person that sees it will be able to read it to decide whether they want to read your post. This is usually your first impression on the reader...make it count!
I've listed a few of my favorite graphic-friendly fonts for blogs below. You can click the links below the graphics to download for free!
Montez Regular // Lobster Two // Pupcat // Mom's Typewriter // Pacifico // Komika Axis // Whackadoo // Arizonia
Allura // Bada Boom // Caviar Dreams // Pharmacy MMX // Great Vibes // Henny Penny // Dancing Script
Risqué Regular // Bebas Regular // Slapstick Comic // Honey Script // Ashbury Light // Whitehall // Alex Brush