Using Photoshop, Gimp or the many other software options may be just what you need. In this example, I've used Gimp to outline the rose, I can then remove the background and fine tune things using the many tools in the software.

This can be tedious, but if you are comfortable with image editing software, it might be easier to than using Graphics Studio. Many of these programs also have tools to do the job. It's a matter of learning more software.

Not only can you remove the background, you can use these tools to make other edits and create collages of images

BUT these days there are also online services that do an amazing job of this.

Here is one I found with a simple Google search. The website is remove.bg. It's free and completely online.

Simply upload your image and Voila! the background is gone.

This is a very simple example, and the results will vary with your image, but it's worth a try.

Even if the removal isn't perfect, you can fine-tune it in another software, Graphics Studio or Stitch Designer.