It's hard to see . Use a program like "LunaPic" . It's totally free and No Download . Crop and adjust lighting clarity etc.
protip: Google is your friend. Take your coin, type in the year, the country, and the denomination. Then, check out either the NGC link or the numista links. Those are the two best sites for world coins. The NGC will give you values for the coins but I would take most of those with a grain of salt.
Also, You need to work on your pictures if you want to get answers. Crop them so that the coin is the picture, not the notebook...Ensure it is properly oriented and in focus as well. Also, show both sides of the coin. You can do quite a bit with just a camera phone. I took these pictures with my iphone6:
100 Pesetas, would have been worth around a dollar in 2000. These do not have any collector value, actually worth even less than their currency value back when it was in use. If you only have one of these, it's not worth listing (maybe 50 cents) but in large bulk amounts, people will buy Pre-Euro coins on ebay (if they're listed at fair prices). Hold onto it in my opinion. If you had like a hundred of them, they might bid for $30.
Anything above 100 Pesetas including 500 Peseta coins and 1000Pts banknotes can be exchanged for Euro's at banks in Spain. I've recently sold 38,000 Pesetas in coins and notes on eBay. I got around £200 ($250)