Is it possible to do SMP on my temples? Will it look natural and good?

SMP on the scalp can look great if you choose a highly-experienced surgeon who is competent in various micropigmentation techniques. 
Also, it is difficult to provide you with useful advice without photographs. Even with photographs you will find varying views and opinions from our community of exceptional doctors. Please upload photographs or visit a surgeon in person for more information. Since every case is different, and to ensure that your hair and hairline look how you envision it, it is pivotal to consult with an experienced hair restoration surgeon for a complete range of options that are appropriate for your situation.
At the Foundation for Hair Restoration in NYC, I work with the world-renowned hair expert Dr. Jeffrey Epstein and his team to create beautiful, natural results for any hair type.
Gary Linkov, MD
Hair Specialist
Manhattan

Yes, you can have SMP to your temples.  See the many examples on my BEFORE AFTER photos on RealSelf (there are at least 4 or 5 examples with hair and no hair)
Always consult with your doctor to make sure it is right for your particular case.

It´s impossible to say without clear images. But one factor is going to be the contrast between your skin complexion and the pigment tone used. It maybe simply the pigment stands out too much from the surrounding hair and looks unnatural. Basically does not add to the look of fullness just sits there. If the case you may consider starting the pigment further back within your existing hair as an option. 

I prefer not to SMP temples unless we are creating a shaved effect. In that case and if you have lost your temporal hair you have no choice but to recreate the temporal hairline with SMP.

SMP can be used as a density fill at your temples with very good results. A talented practitioner should be able to apply the pigment in a subtle way that enhances your temples without looking out of balance with the rest of your hairline. 

You can put the pigments from Scalp Micropigmentation just behind the hairline about 1/4 inch and use it to address the thinning