The best advise I got when I was learning how to carve was to do your pattern 4 times. You will be amazed at the amount you will improve each time.
A thumbprint tool is a narrow pear shader. It is used in Sheridan patterns in place of the pear shader. It is not used that much in western floral (what you did).
Move your seeds closer togeather. They should almost be touching. Yours are far to spread out. This is a good thing to practice on scrap.
If your ceramic blade is cutting better than your steel blade then your blade is dull. A steel blade WHEN PROPERLY SHARPENED will cut better than ceramic. A ceramic seldom gets dull though, so it is sometimes considered easier to use than to keep stroping and sharpening a steel blade. All steel blades are not equil either.
Before you start cutting, give the leather a coat of Lexol, it will cut a little easier. Also use Bee Natural Pro Carve instead of water to case.
A few more strikes with the camoflage tool will make a better "sunburst" from the flower center.
Decorative cuts from the outside to the center. Start deep and feather it out to nothing. Most of your regular cuts should be about half the thickness of the leather. Deep with thick leather, shallow with thin leather.
Practice, a lot. Personally, I toss more pieces than I finish. I do not want others to see my mistakes.
Aaron