The way to get the best results when converting from Jpg to SVG is to open the jpg image in an svg editor (such as Adobe Illustrator or Inkscape) and trace over the image with the pencil or pen tool- you can see some tips on creating your own SVGs here. Using automatic conversion tools may give varying results. If you upload one of your images here and let us know how you would like it to draw differently, we could take a look at it for you and see if we can advise any ways to improve the SVG.
I have uploaded some images in jpg format but somehow their look and feel is not perfect. How can I convert my images to SVG format? I tried using some online tools for the format conversion but not sure if I am doing it right.