I made a tutorial on my roses :) See the BLOG for more info.
Roses Nail Art Tutorial Step by Step:
Paint your nail with a base color. I recommend using a light shade. The roses will pop more and will be contrasting nicely with your background.
With your dotting tool make three random circles on your nail with the lightest of the pinks. They don’t have to be perfect.
With your medium pink start shading the roses. I used my thin nail art brush, but you can also do it with a toothpick, if you don’t have a brush. Start from the middle of the rose and make half circle strokes going towards the outside of the flower.
Take the darkest shade of pink and do the same as in step 3. Don’t overdo it with the dark pink or your rose will lose the depth. Remember to leave some light pink spaces in between.