Can't offer any suggestions to have him look more male. He looks similar on coloration to Ruby's father.
For those who may not have seen the tv series to refer to you can see Ruby's father (and her family though her siblings are not as clearly seen) at a screenshot at:
http://landbeforetime.wikia.com/wiki/Image..._%26_Family.jpgHer father's head fin (or whatever you call that) is a bit larger then her mothers and slightly differently shaped. Though you could not tell since in Littlefot's picture his character's head is almost straight on shot so at that angle the exact size and shape would not be clearly shaped, and also the head fin may have some individual shape and size differences so all adult females fast runners may not have head fins of the same exact shape and size as Ruby's mother, nor males the same exact size & shape as Ruby's father, since we've seen only 5 fast runners I think, 3 of them not adults yet and only 2 being adults 1 of each gender. We've not seen a lot of them so really can't tell if there are more then 2 colors, with all female fast runners being pink, and all males blue, or if there are other colors.
In general most of the dino males seem to be darker then most females, and the shade of Ruby's father and Blueberry are darker then a female blue dino, in my opinion at least. This is a longer post then I usually do or like doing.
With dinos the problem is there is no bumps on the chest or other ways to tell apart from the voice, and that males tend to be darker then females. They are inconsistent as to eyelashes, to bad since that could have been another way to easily tell.
