And double up on the shade side of your traditional pieces. I think you'll find it will give the eye an easier path to follow in your pieces. Keep it up man your doing pretty good.
Honestly, You are a traditional tattooist in your style. And it doesn't cross over well into your frogs. I like this piece. I would keep with the traditional feel and add more solid coloring. And I would double up on your outlines like the cattle skull.