Roses are Red! Reds can be difficult to achieve dimension. You can try different combos but it seems red is still red...there isn't much of a color difference. So the question is how do you make your Copic Reds POP with dimension? In these roses I used E44. If you look at the Copic Color Wheel the R's and YR's hug the E's, not the Grays. By using E44 then going over it with R46 it added depth. It also gives them a much richer look. The keys is to color over the E color over the darkest R color this will tent the E to match, then you go over it with that darkest red color.
Ok...so...if we are talking about deepening shadows we should talk about a glowing highlight right? You can leave white which wis most common and will give a nice pop. However, do you look at red roses and see white? Nah! Here I used R12 which is very light. I colored the entire petal with R12 as a base coat, then colored the details leaving a small line following the curve and shape of the petal. Color over this small line with R12 as the final touch. It will not blend and will displace a little of the surrounding red. It is important to use a light touch because you don't want to expand this line. You've just created a nice thin glow.