Roses are a cliche flower but everyone loves them and wants to know how to recreate them into their work. You have the classic rose that you get for valentines day and these can be in different stages based on how full you want your flower to look. The second rose which I almost prefer more is the wild rose. It still requires adding dimensions with the petals but it has more of a simple elegant look.
Classic Roses

Rose with Stem 
Classic Rose with leaves
When you are carving the classic rose there are a few things to consider. Are you going to add the thorny stem or the rose leaves? Your answers are going to vary and it really depends on what you are putting the carving on. If you are carving a belt I would stick to the main part of the rose with a few petals. If your project is more for a purse or book cover you have room to add a stem. The hardest part is adding dimensions to your petals. When you starts beveling it is important to establish which petals are in front and which aren’t. Make sure your layering looks natural and folds how a real flower does.
Wild Roses

Wild Rose Belt 
Wild Rose Book Cover
Wild roses are less boom in your face, but I think they create beautiful designs that flow. Just like a normal rose it is important to establish how the petals are layered, but there are fewer petals and they other lap less. When you are carving this type of flower I have found that adding dimension within the petal makes or breaks the flower. I take a line tool and gently glide it across the top of the petal to the center. I start in the corners of each petal and do this two to three times. This way the flower pops more and has that natural folding look if you were to see a wild rose while out on the range.
Conclusion
Whatever type of rose you pick for your project it will look good. They are a great go to flowers and have never failed me. Like any design for leather carving you can find different variations of each flower. I suggest finding one you like and adapting it to your own personal style.