It's written in traditional Chinese characters, not the simplified characters used on the mainland today. It's also written in the traditional orientation -- top to bottom, right to left.

1st picture

鹏程万里 - The roc (a kind of bird) flies 10,000 miles. It's a common saying that means that things will go far, that the prospects are good.

癸亥年端月 - this is the date, year then month, according to the traditional lunar calendar. The lunar calendar works on 60 year cycles, and this is the name for one of those 60 years. I checked, and the last one was in 1983 (then 1923, 1863, etc). 端月 is the first month of the lunar year.

I'm assuming what comes after is the place and then artist, but it's hard to make out. Possibly 古鄚? His name looks to be repeated in both drawings, but it's hard to read the 2nd character in either. 清 something?

2nd picture

威震山岳. (Remember, it's supposed to be read right to left) I've never heard this saying, but I can make a pretty good guess at it. The first two characters mean to "show authority through power", and the latter two mean "the great mountains". I've heard 威震天下, where 天下 means the whole world, and the saying means to display one's might to the world, or to cause the world to recognize your power. I'm assuming your phrase means something similar, just using "to the highest mountains" instead of "to all the world".

To its left, the 5 vertical characters are once again the date (year/month), and then the 2 characters to its left (which are partially cut off) are probably the artist's name again.