Refine PowerPoint slides

Hello, I am a consultant who needs to showcase my very best work through four decks containing PowerPoint slides (a total of around 250 slides in total). I convert these to PDF documents and send to clients to impress them with the quality of work that we do. Though I am very good at PowerPoint and think that my slides look great, I have received some feedback that the slides do not look professional and that the colors, shapes, shading, themes, lines, borders, general appearance, etc. are not as top notch as they can be. The slides do not look as "glossy" and "sales ready" as one might find in a 'marketing brochure'. I need the touch of a true professional (who is at heart an artist!!) that can transform the 250+ slides in these decks to look amazingly good. To demonstrate your skills and artistry there are three options - please choose one: a) Please review the FOUR attached slides, transform them to look the best you can and send them back to me b) Please send me a "before" and "after" of four slides you choose to show how well you do your work, OR c) Please do (a) AND (b) to give me even a better ides of your skills In your bid PLEASE BE SURE to include a TOTAL COST quote for 250 slides in your bid - this means tell me how many hours you will take for refining 250 slides and how much you will charge per hour. Also, the colors in these slides are the colors my company uses as our 'theme'. So, even though you can change the shading of the colors, it would be great if your kept the core colors more or less the same. Here is the best part: if you are selected, it is quite certain that I will be sending more work your way on a regular basis. I will also assume that the quote you give me for 250 slides will apply in the future at more or less the same rate (i.e., 'per slide' basis). So, please let me know if your rate is going to be different in the future for more work, Thank you!